<PAGE>
                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 10-Q/A

(Mark One)
[X]   QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
      ACT OF 1934

For the quarterly period ended June 30, 2002.

                                       OR

[ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

For the transition period from _____________________ to ______________________.

Commission file no. 0-6272

                                   DATUM INC.
             (Exact name of registrant as specified in its charter)

                   DELAWARE                       95-2512237
        (State or other jurisdiction of        (I.R.S. Employer
         incorporation or organization)       Identification No.)

                     9975 Toledo Way, Irvine, CA 92618-1819
             (Address of principal executive offices) (Zip code)

                                 (949) 598-7500
              (Registrant's telephone number, including area code)

                                 Not Applicable
              (Former name, former address and former fiscal year,
                         if changed since last report)

Indicate by a check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to the
filing requirements for the past 90 days.

YES X.   NO ___.

The registrant had 6,299,151 shares of common stock outstanding as of August 9,
2002.

                                       -1-

<PAGE>

                                      INDEX

<TABLE>
<CAPTION>

<S>          <C>                                                                                     <C>
PART I.      FINANCIAL INFORMATION

Item 1.      Financial Statements.....................................................................3

Item 6.      Exhibits and Reports on Form 8-K........................................................11
</TABLE>

                                       -2-

<PAGE>

        This amended report on Form 10-Q/A is filed solely to amend the
disclosure contained in "Part I. Item 1--Financial Statements" contained in the
Condensed Consolidated Balanced Sheet, "Liabilities and Stockholder's Equity."
Registrant inadvertently included a line item entry as "Long-term debt," which
amount had been reclassified and should have been inserted as a line item entry
under Current Liabilities, "Long-term debt classified as current." Although the
reclassification was not reflected in the balance sheet, the reclassification
was discussed in Registrant's report on Form 10-Q for the period ended June 30,
2002 in Part I, Item 1, Financial Statements, under "Note E - Debt" and Part I,
Item 2, Management's Discussion and Analysis of Financial Condition and Results
of Operations, under "Liquidity and Capital Resources."


PART I. FINANCIAL INFORMATION

ITEM 1.   FINANCIAL STATEMENTS


                           DATUM INC. AND SUBSIDIARIES

                      CONDENSED CONSOLIDATED BALANCE SHEET

                        (IN THOUSANDS, EXCEPT SHARE DATA)
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                                    June 30,      December 31,
                                                                                      2002            2001
                                                                                  -----------    -------------
<S>                                                                               <C>            <C>
                                     ASSETS

Current assets

     Cash and cash equivalents................................................... $     2,471    $       2,381
     Restricted cash.............................................................         530            1,828
     Accounts receivable, less allowance for doubtful accounts of $671 and $574..      14,834           22,023
     Costs and estimated earnings in excess of billings..........................       2,477            3,456
     Inventories
     Purchased parts.............................................................      10,907           14,247
     Work-in-process.............................................................       7,195            7,440
     Finished products...........................................................       6,966            6,786
                                                                                  -----------    -------------
                                                                                       25,068           28,473
     Prepaid expenses............................................................         689              468
     Deferred income taxes.......................................................       3,158            3,158
     Income tax refund receivable................................................         897            2,222
                                                                                  -----------    -------------
          Total current assets...................................................      50,124           64,009
Plant and equipment
     Land........................................................................       2,040            2,040
     Buildings...................................................................       8,061            5,867
     Equipment...................................................................      26,081           25,997
     Leasehold improvements......................................................       1,128            1,362
                                                                                  -----------    -------------
                                                                                       37,310           35,266
Less accumulated depreciation and amortization...................................      22,580           21,221
                                                                                  -----------    -------------
                                                                                       14,730           14,045
Deferred income taxes............................................................       4,746              374
Excess of purchase price over net assets acquired, net of accumulated
 amortization of $11,459 and $11,459.............................................       8,549            8,549
Capitalized software development costs...........................................       3,319            2,379
Other assets.....................................................................       1,653              831
                                                                                  -----------    -------------
                                                                                  $    83,121    $      90,187
                                                                                  ===========    =============
</TABLE>

     See Notes to Condensed Consolidated Financial Statements

                                       -3-

<PAGE>

                           DATUM INC. AND SUBSIDIARIES

                      CONDENSED CONSOLIDATED BALANCE SHEET

                        (IN THOUSANDS, EXCEPT SHARE DATA)
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                           June 30,         December 31,
                                                                             2002               2001
                                                                         ------------      -------------
                                                                          (restated)
<S>                                                                      <C>               <C>
                          LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities

     Accounts payable...............................................     $      5,695      $       7,041
     Accrued salaries and wages.....................................            2,206              3,047
     Accrued warranty...............................................            1,386              1,577
     Other accrued expenses.........................................              693                998
     Deferred revenue...............................................              313                314
     Current portion of long-term debt..............................               60              1,810
     Long-term debt classified as current...........................            2,605                 --
                                                                         ------------      -------------
          Total current liabilities.................................           12,958             14,787
Long-term debt......................................................               --              2,635
Postretirement benefits.............................................            1,178              1,239
Other long-term liabilities.........................................              498                674
Commitments and contingencies.......................................

Stockholders' equity

     Preferred stock, par value $.25 per share
        Authorized--1,000,000 shares Issued--none...................
     Common stock, par value $.25 per share
        Authorized--10,000,000 shares
        Issued--6,280,946 shares in 2002
        6,209,721 shares in 2001....................................            1,570              1,552
     Additional paid-in capital.....................................           54,356             53,619
     Retained earnings..............................................           13,385             16,704
     Unamortized stock compensation.................................             (103)              (224)
     Accumulated other comprehensive loss...........................             (721)              (799)
                                                                         ------------      -------------
                                                                               68,487             70,852
                                                                         ------------      -------------
Total liabilities and stockholders' equity..........................     $     83,121      $      90,187
                                                                         ============      =============
</TABLE>

     See Notes to Condensed Consolidated Financial Statements

                                       -4-

<PAGE>

                           DATUM INC. AND SUBSIDIARIES

                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                   Three Months Ended June 30,   Six Months Ended June 30,
                                                                   ---------------------------   -------------------------
                                                                      2002             2001         2002           2001
                                                                   ----------       ----------   ---------       ---------
<S>                                                                <C>              <C>          <C>             <C>
Net sales.................................................         $   15,777       $   28,591   $  31,571       $  60,844
Operating expenses:
     Cost of sales........................................              9,609           15,544      20,025          33,005
     Selling..............................................              3,660            4,504       7,284           8,561
     Product development..................................              2,827            3,508       5,906           7,299
     General and administrative...........................              2,830            3,747       6,204           7,736
     Impairment of long-lived asset.......................                               2,718                       2,718
                                                                   ----------       ----------   ---------       ---------
Operating income (loss)...................................             (3,149)          (1,430)     (7,848)          1,525
                                                                   ----------       ----------   ---------       ---------
Interest expense..........................................                 33              101          84             220
Interest income...........................................                (13)             (10)        (32)            (46)
                                                                   ----------       ----------   ---------       ---------
Income (loss) before income taxes.........................             (3,169)          (1,521)     (7,900)          1,351
Income tax provision (benefit)............................             (1,554)            (350)     (4,582)            769
                                                                   ----------       ----------   ---------       ---------
Net income (loss).........................................         $   (1,615)      $   (1,171)  $  (3,318)      $     582
                                                                   ==========       ==========   =========       =========
Net income (loss) per common share:

     Basic................................................         $    (0.26)      $    (0.19)  $   (0.53)      $    0.10
                                                                   ==========       ==========   =========       =========
     Diluted..............................................         $    (0.26)      $    (0.19)  $   (0.53)      $    0.09
                                                                   ==========       ==========   =========       =========
Shares used in per share calculation:

     Basic................................................              6,258            6,135       6,239           6,110
                                                                   ==========       ==========   =========       =========
     Diluted..............................................              6,258            6,135       6,239           6,340
                                                                   ==========       ==========   =========       =========
</TABLE>

See Notes to Condensed Consolidated Financial Statements

                                       -5-

<PAGE>

                           DATUM INC. AND SUBSIDIARIES
                 CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS
                                 (IN THOUSANDS)
                                   (UNAUDITED)

<TABLE>
<CAPTION>

                                                                                            Six Months Ended
                                                                                                 June 30,

                                                                                         -----------------------
                                                                                           2002         2001
                                                                                         ---------   -----------
<S>                                                                                      <C>         <C>
Cash flows from operating activities:
      Net income (loss).............................................................     $  (3,318)  $       582
                                                                                         ---------   -----------
      Adjustments to reconcile net income (loss) to net cash provided by
       operating activities
           Depreciation and amortization............................................         1,597         1,789
           Amortization of capitalized software development costs...................           216
           Write-down of impaired asset.............................................                       2,718
           Amortization of goodwill.................................................                       1,063
           Contribution of shares of common stock to the Company's 401(k) plan......           388           340
           Non-cash compensation....................................................           121           184
           Income tax benefit from stock options exercised..........................            32           298
      Changes in assets and liabilities:
           Decrease in accounts receivable..........................................         7,188         8,664
           (Increase) decrease in costs and estimated earnings in excess
            of billings.............................................................           979        (1,282)
           (Increase) decrease in inventories.......................................         3,405        (3,165)
           (Increase) decrease in income tax receivable.............................         1,325        (2,156)
           Increase in prepaid expenses.............................................          (221)         (154)
           Increase in deferred income taxes........................................        (4,372)
           Increase in other assets.................................................          (822)         (511)
           Decrease in accounts payable.............................................        (1,348)       (1,913)
           Decrease in accrued expenses.............................................        (1,335)         (698)
           Decrease in income taxes payable.........................................                      (1,705)
           Increase (decrease) in postretirement benefits...........................           (61)          149
           Decrease in other long-term liabilities..................................          (176)          (18)
                                                                                         ---------   -----------
      Total reconciling items.......................................................         6,916         3,603
                                                                                         ---------   -----------
      Net cash provided by operating activities.....................................         3,598         4,185
                                                                                         ---------   -----------
Cash flows from investing activities:

      Capital expenditures..........................................................        (2,266)       (2,153)
      Capitalized software development costs........................................        (1,156)       (1,273)
                                                                                         ---------   -----------
           Net cash used by investing activities....................................        (3,422)       (3,426)
                                                                                         ---------   -----------
Cash flows from financing activities:

      Reduction of line of credit...................................................                        (485)
      Proceeds from long-term debt..................................................                       2,725
      Payments of long-term debt....................................................        (1,780)       (1,500)
      (Increase) decrease in restricted cash........................................         1,298        (2,325)
      Proceeds from exercise of stock options.......................................           173           182
      Proceeds from ESP plan........................................................           162           190
                                                                                         ---------   -----------
           Net cash provided by (used for) financing activities.....................          (147)       (1,213)
                                                                                         ---------   -----------
Effect of exchange rate changes on cash and cash equivalents........................            61          (377)
                                                                                         ---------   -----------
Net increase (decrease) in cash and cash equivalents................................            90          (831)
Cash and cash equivalents at beginning of period....................................         2,381         1,017
                                                                                         ---------   -----------
Cash and cash equivalents at end of period..........................................     $   2,471   $       186
                                                                                         =========   ===========
</TABLE>

See Notes to Condensed Consolidated Financial Statements

                                       -6-

<PAGE>

                           DATUM INC. AND SUBSIDIARIES

              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

NOTE A - BASIS OF PRESENTATION

        The accompanying unaudited condensed consolidated financial statements
have been prepared in accordance with the requirements of Form 10-Q and,
therefore, do not include all information and footnotes which would be presented
were such financial statements prepared in accordance with generally accepted
accounting principles. The condensed consolidated balance sheet at December 31,
2001 was derived from the audited consolidated balance sheet at that date which
is not presented herein.

        In the opinion of management, the accompanying financial statements
reflect all adjustments, which are normal and recurring, necessary to provide a
fair statement of the results for the interim period presented. These condensed
consolidated financial statements should be read in conjunction with the audited
financial statements presented in the Company's Annual Report on Form 10-K for
the year ended December 31, 2001. Operating results for interim periods are not
necessarily indicative of operating results for an entire year.

        The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of sales and expenses during the reporting
period. Actual results could differ from those estimates.

NOTE B - EARNINGS PER SHARE

        Net income per share-basic excludes dilution and is computed by dividing
net income by the weighted average number of common shares outstanding during
the reporting period. Net income per share-diluted reflects the potential
dilutive effect, calculated using the treasury stock method, of additional
common shares that are issuable upon exercise of outstanding stock options and
stock warrants as follows (in thousands):

<TABLE>
<CAPTION>

                                                           Three Months Ended June 30,         Six Months Ended June 30,
                                                         ------------------------------      -----------------------------
                                                            2002              2001              2002              2001
                                                         -----------      -------------      -----------      ------------
<S>                                                            <C>                <C>              <C>               <C>
     Basic shares outstanding (weighted average)               6,258              6,135            6,239             6,110
     Effect of dilutive securities                                                                                     230
                                                         -----------      -------------      -----------      ------------
     Diluted shares outstanding                                6,258              6,135            6,239             6,340
                                                         ===========      =============      ===========      ============
</TABLE>

        Options outstanding during the three months ended June 30, 2002 and 2001
to purchase approximately 825,000 and 412,000 shares of common stock, and
options outstanding during the six months ended June 30, 2002 and 2001 to
purchase approximately 762,000 and 361,000 shares of common stock, respectively,
were not included in the computation of dilutive securities because inclusion
would be anti-dilutive.

NOTE C - COMPREHENSIVE INCOME

        Total comprehensive loss was $(1.3) million and $(1.4) million for the
three months ended June 30, 2002 and 2001, respectively. For the six months
ended June 30, 2002 and 2001, total comprehensive income (loss) was $(3.2)
million and $0.2 million, respectively. The difference from net income as
reported is the change in cumulative translation adjustment.

NOTE D - SEGMENT AND RELATED INFORMATION

        The Company has four reportable segments: Wireless; Wireline; Timing,
Test and Measurement (TT&M); and Trusted Time. The Wireless segment, in Irvine,
CA, produces equipment primarily for the wireless telecommunications market. The
Wireline segment, in Austin, TX and Hofolding, Germany, manufactures products
primarily for the wireline telecommunications market. In Beverly, MA, the TT&M
segment, goods are produced for the enterprise computing, test and measurement,
telecommunications and satellite markets. The Trusted Time segment, in
Lexington, MA, provides secure time management solutions that manage the
integrity of time in digital business processes for the Information Technology
market.

        The Company evaluates performance of its segments and allocates
resources to them based on segment operating income. Segment operating

                                       -7-

<PAGE>

income. Segment operating income does not include corporate expenses,
amortization of goodwill and intersegment profit elimination. Identifiable
assets include accounts receivable, inventories, and land, building and
equipment and do not include cash, income tax refund receivable and deferred
income taxes, prepaid expenses, goodwill and other long-term corporate assets.

The tables below present information about reported segments for the quarters
ended June 30 (amounts in thousands):

SEGMENT SALES:

<TABLE>
<CAPTION>

                                                                                     Trusted

                                          Wireless      Wireline         TT&M          Time         Total
                                          ---------    ----------     ----------    ----------    ----------
    <S>                                   <C>          <C>            <C>           <C>           <C>
    2002:

    Total sales                           $   5,163    $    6,440     $    5,710    $      746    $   18,059
    Intersegment sales                       (1,167)           (3)        (1,086)          (26)       (2,282)
                                          ---------    ----------     ----------    ----------    ----------
    Outside sales                         $   3,996    $    6,437     $    4,624    $      720    $   15,777
                                          =========     =========     ==========    ==========    ==========

    2001:

    Total sales                           $  10,148    $   14,555     $    9,415    $      273    $   34,390
    Intersegment sales                       (4,041)          (23)        (1,734)           (1)       (5,799)
                                          ---------    ----------     ----------    ----------    ----------
    Outside sales                         $   6,107    $   14,532     $    7,680    $      272    $   28,591
                                          =========    ==========     ==========    ==========    ==========
</TABLE>

SEGMENT OPERATING INCOME (LOSS):

<TABLE>
<CAPTION>

                                                                                                   Trusted

                                          Wireless      Wireline         TT&M          Time         Total
                                          ---------    ----------     ----------    ----------    ----------
    <S>                                   <C>          <C>            <C>           <C>           <C>
    2002                                  $    (832)   $     (452)    $       39    $     (584)   $   (1,829)
    2001                                  $     778    $    1,672     $    1,563    $     (851)   $    3,162
</TABLE>

A reconciliation of segment operating income to consolidated amounts as reported
for the quarters ended June 30:

                                                     2002       2001
                                                   --------   --------
    Segment operating income                       $ (1,829)  $  3,162
    Corporate expenses                               (1,194)    (1,267)
    Amortization of goodwill                                      (531)
    Write-down of impaired asset                                (2,718)
    Intercompany profit elimination                    (126)       (76)
                                                   --------   --------
             Consolidated operating income         $ (3,149)  $ (1,430)
                                                   ========   ========

The table below presents identifiable segment assets as of June 30, 2002
compared to prior year end:

IDENTIFIABLE SEGMENT ASSETS:

<TABLE>
<CAPTION>

                                                                           Trusted

                                     Wireless     Wireline      TT&M         Time        Total
                                     ---------   ----------  ----------   ----------   ----------
    <S>                              <C>         <C>         <C>          <C>          <C>
    June 30, 2002                    $  16,154   $   18,736  $   19,055   $    3,831   $   57,776
    December 31, 2001                $  18,989   $   22,262  $   22,560   $    3,791   $   67,602
</TABLE>

NOTE E - DEBT

        On May 10, 2002, Datum amended its credit facility with Wells Fargo
Bank. The credit facility expires May 29, 2003. The credit facility was reduced
from $16.0 million to $10.0 million. The credit facility includes a line of
credit and a term loan that funded July 7, 2000. The term loan is payable in
monthly principal installments of $250,000 plus interest, which began August 1,
2000. Interest on the term loan is fixed at 9.15%, and interest on the line of
credit is payable monthly at prime or at LIBOR plus 2.5%. The term loan matured
and was paid off on June 15, 2002. Datum does not expect to replace the term
loan in the foreseeable future.

        On June 1, 2001, the Massachusetts Development Finance Agency issued a
$2.7 million industrial development bond on Datum's behalf to finance the
expansion of Datum's manufacturing facility in Beverly, Massachusetts. The bond
matures on May 1, 2021. Interest on the bond is payable monthly at an adjustable
rate of interest. The remarketing agent determines the interest rate for each
rate period to be the lowest rate which in its judgment would permit the sale of
the bonds at par. The bond is collateralized by a letter of credit issued under
Datum's credit facility with Wells Fargo Bank.

                                       -8-

<PAGE>

        In connection with the issuance of promissory notes in 1996 that were
fully paid off in 2000, Datum issued to The Prudential Insurance Company of
America common stock warrants which currently allow for the purchase of 176,303
shares of common stock at an exercise price per share of $11.415. The warrants
expire in September 2003.

     At June 30, 2002, Datum was in violation of a debt covenant under the terms
of the May 2002 amended credit agreement facility with Wells Fargo Bank, for
which Datum received a waiver. However, because it is not probable that Datum
will be in compliance with all debt covenants under the existing credit facility
with Wells Fargo Bank through the second quarter 2003, and because the credit
facility serves as collateral for the $2.7 million industrial development bond,
Datum has reclassified the long term portion outstanding under the $2.7 million
industrial development bond as a current obligation. Datum is in the process of
negotiating an amendment to the credit facility with Wells Fargo Bank.

NOTE F - RECENTLY ISSUED ACCOUNTING STANDARDS

        In June 2001, the Financial Accounting Standards Board issued Financial
Accounting Standards No. 141, "Business Combinations," (FAS 141) and Financial
Accounting Standards No. 142, "Goodwill and Other Intangible Assets" (FAS 142).
FAS 141 establishes new accounting and reporting standards for business
combinations and will require that the purchase method of accounting be used for
all business combinations initiated after June 30, 2001. FAS 142 establishes new
standards for goodwill acquired in a business combination, eliminates
amortization of goodwill and sets forth methods for periodically evaluating
goodwill for impairment. The Company adopted the provisions of these statements
in the quarter ended March 31, 2002. The implementation of FAS 142 resulted in a
reduction of goodwill amortization of approximately $225 thousand per quarter
beginning in 2002. Datum performed a transitional goodwill impairment test as of
June 30, 2002, at which time it was determined that no impairment existed. The
impact from implementing FAS 141 was not material to the Company's financial
position or results of operations. The following unaudited pro forma summary
presents the Company's net income and per share information as if the Company
had been accounting for its goodwill under SFAS No. 142 for all periods
presented:

<TABLE>
<CAPTION>

                                                                  Three Months Ended          Six Months Ended
                                                                       June 30,                   June 30,
                                                              -------------------------   ------------------------
                                                                 2002           2001         2002          2001
                                                              ----------    -----------   ----------    ----------
<S>                                                           <C>           <C>           <C>           <C>
        Reported net income                                   $   (1,615)   $    (1,171)  $   (3,318)   $      582
        Add back goodwill amortization, net of tax                                  445                        890
                                                              ----------    -----------   ----------    ----------
        Adjusted net income                                   $   (1,615)   $      (726)  $   (3,318)   $    1,472
                                                              ===========   ===========   ==========    ==========
        Reported basic earnings per share                     $    (0.26)   $     (0.19)  $    (0.53)   $     0.10
        Add back goodwill amortization, net of tax                                 0.07                       0.14
                                                              -----------   -----------   ----------    ----------
        Adjusted basic earnings per share                     $    (0.26)   $     (0.12)  $    (0.53)   $     0.24
                                                              ==========    ===========   ==========    ==========
        Reported diluted earnings per share                   $    (0.26)   $     (0.19)  $    (0.53)   $     0.09
        Add back goodwill amortization, net of tax                                 0.07                       0.14
                                                              -----------   -----------   ----------    ----------
        Adjusted diluted earnings per share                   $    (0.26)   $     (0.12)  $    (0.53)   $     0.23
                                                              ==========    ===========   ==========    ==========
</TABLE>

        In June 2001, the Financial Accounting Standards Board issued Financial
Accounting Standards No. 143, "Accounting for Asset Retirement Obligations,"
(FAS 143). FAS 143 addresses financial accounting and reporting for obligations
associated with the retirement of tangible long-lived assets and the associated
asset retirement costs. The Company is required to adopt the provisions of FAS
143 no later than the first quarter of its fiscal year 2003. The Company is
currently evaluating the impact of adopting FAS 143.

        In August 2001, the Financial Accounting Standards Board issued
Financial Accounting Standards No. 144, "Accounting for the Impairment or
Disposal of Long-Lived Assets," (FAS 144). FAS 144 addresses financial
accounting and reporting for the impairment or disposal of long-lived assets.
FAS 144 supersedes FASB Statement No. 121, "Accounting for the Impairment of
Long-Lived Assets and for Long-Lived Assets to Be Disposed Of," and the account
and reporting provisions of APB Opinion No. 30, "Reporting the Results of
Operations-Reporting the Effects of Disposal of a Segment of a Business, and
Extraordinary, Unusual and Infrequently Occurring Events and Transactions," for
the disposal of a segment of a business (as previously defined in that Opinion).
This Statement also amends ARB No. 51, "Consolidated Financial Statements," to
eliminate the exception to consolidation for a subsidiary for which control is
likely to be temporary. The Company adopted the provisions of FAS 144 in the
quarter ended March 31, 2002. The impact from implementing FAS 144 was not
material to the Company's financial position or results of operations.

        In April 2002, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 145 (FAS 145). This Statement rescinds
FASB Statement No. 4, Reporting Gains and Losses from Extinguishment of Debt,
and an amendment of that Statement, FASB Statement No. 64, Extinguishments of
Debt Made to Satisfy Sinking-Fund Requirements. This Statement also rescinds
FASB Statement No. 44, Accounting for Intangible Assets of Motor Carriers. This
Statement amends FASB Statement No. 13, Accounting for Leases, to eliminate an
inconsistency between the required accounting for sale-leaseback transactions
and the required accounting for certain lease modifications that have economic
effects that are similar to sale-leaseback transactions. This Statement also
amends other existing authoritative pronouncements to make various technical
corrections, clarify meanings, or describe their applicability under changed
conditions. Datum is

                                       -9-

<PAGE>

currently evaluating the impact of FAS 145.

        In June 2002, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 146, "Accounting for Costs Associated with
Exit or Disposal Activities," (FAS 146) . FAS 146 requires that a liability for
a cost that is associated with an exit or disposal activity be recognized when
the liability is incurred. It nullifies the guidance of the Emerging Issues Task
Force ("EITF") in EITF Issue No. 94-3, Liability Recognition for Certain
Employee Termination Benefits and Other Costs to Exit and Activity (including
Certain Costs Incurred in a Restructuring). Under EITF Issue No. 94-3, an entity
recognized a liability for an exit cost on the date that the entity committed
itself to an exit plan. In FAS 146, the Board acknowledges that an entity's
commitment to a plan does not, by itself, create a present obligation to other
parties that meets the definition of a liability. FAS 146 also establishes that
fair value is the objective for the initial measurement of the liability. FAS
146 will be effective for exit or disposal activities that are initiated after
December 31, 2002. Datum is currently evaluating the impact of FAS 146.

NOTE G - SUBSEQUENT EVENT

        In July 2002, Datum reduced its workforce by approximately 60 employees.
Datum expects to take a severance charge of approximately $0.8 million in the
quarter ended September 30, 2002.

                                      -10-

<PAGE>

Item 6. Exhibits and Reports on Form 8-K

        (a)    Exhibits

99.1    Certification of Periodic Report by Chief Financial Officer

99.2    Certification of Periodic Report by Chief Executive Officer

                                      -11-

<PAGE>

        Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

DATUM INC.


<TABLE>

<S>                                                                <C>
 /s/ Erik H. van der Kaay                                          Date    August 28, 2002
-----------------------------------------------------------             ------------------
Erik H. van der Kaay, President and Chief Executive Officer


  /s/ Robert J. Krist                                              Date    August 28, 2002
-----------------------------------------------------------             ------------------
Robert J. Krist, Vice President and Chief Financial Officer
</TABLE>

                                      -12-

<PAGE>

EXHIBIT INDEX

Sequentially
 Numbered

Exhibit No.    Description

-----------    -----------

99.1           Certification of Periodic Report by Chief Financial Officer

99.2           Certification of Periodic Report by Chief Executive Officer

                                      -13-