STOCK OPTION AGREEMENT

      STOCK OPTION AGREEMENT, dated as of April 13 , 2000 (this "Agreement"), by
and between HIDENET SECURE ARCHITECTURES, INC., a New Jersey corporation with an
address at 103 Medinat Hayehudam  Street,  Hezliya 46733 Israel (the "Grantor"),
and NP PARTNERS,  LLC, a New York limited  liability company with an address c/o
Mark S. Hauser, 83 Garden Road, Scarsdale, New York 10583 (the "Grantee").

                                    RECITALS

            WHEREAS,  simultaneous  with the  execution of this  Agreement,  the
Grantee and  NetworkPrivacy.com,  Inc., a Delaware corporation which is owned by
the Grantor  ("NPI"),  are entering into a Stock and Option  Purchase  Agreement
(the  "Stock and Option  Purchase  Agreement")  pursuant  to which,  among other
things, NPI is issuing to the Grantee Series A Convertible  Preferred Stock (the
"Preferred Stock"); and

            WHEREAS,  in consideration for the payment of the Purchase Price (as
such term is defined in the Stock Purchase Agreement), the Grantee is to receive
the Preferred Stock and an option to acquire common stock of the Grantor; and

            WHEREAS,  the  Grantor  desires  to  grant to the  Grantee,  and the
Grantee desires to acquire from the Grantor, the irrevocable right and option to
purchase  shares of common stock of the  Grantor,  upon the terms and subject to
the conditions set forth herein.

            NOW,  THEREFORE,  in  consideration  of the  premises and the mutual
representations, warranties, covenants, agreements and undertakings contained in
this  Agreement,  and other good and  valuable  consideration,  the  receipt and
sufficiency of which is hereby acknowledged,  the Grantor and the Grantee hereby
agree as follows:

                                    ARTICLE I

                                 GRANT OF OPTION

            SECTION 1.1 Grant of Option for Shares.

      (a) Upon  the  terms  and  subject  to the  conditions  set  forth in this
Agreement,  the Grantor hereby grants to the Grantee the  irrevocable  right and
option (the  "Option") to purchase the Shares.  "Shares"  shall mean (i) 873,336
shares of common stock of the Grantor if the Grantee purchases 160,000 shares of
Preferred  Stock or (ii)  436,668  shares of common  stock of the Grantor if the
Grantee  purchases  80,000 shares of Preferred  Stock and an  appropriately  pro
rated number of shares of Common  Stock of the Grantor if the Grantee  purchases
between  80,000 and 160,000 shares of Preferred  Stock,  subject in any event to
adjustment as provided in Section 1.2.

       (b) At any time after the date  hereof,  the  Grantee  may  exercise  the
Option by sending to the Grantor written notice of its exercise  thereof and the
stock certificate  evidencing the Preferred Stock. Within two business days from
the receipt thereof (the "Option  Closing  Date"),  the Grantor shall deliver to
the Grantee the stock  certificate(s)  evidencing  the Shares,  duly endorsed in
blank or accompanied by stock powers duly executed in blank,  in proper form for
transfer and with all required stock transfer tax stamps affixed.

      (c) Notwithstanding  anything contained herein to the contrary, the Option
shall,  without any action taken by the Grantor,  the Grantee,  NPI or any other
party,  immediately  expire and be of no force and effect upon the conversion of
the Preferred Stock.

            SECTION 1.2 Option Exercise; Anti-Dilution.

            (a) In order to exercise the Option, the Grantee must deliver to the
Grantor  or its duly  appointed  agent,  the stock  certificate  evidencing  the
Preferred  Stock,  duly  endorsed in blank or  accompanied  by stock owners duly
executed in blank.  Upon exercise of the Option,  the  Preferred  Stock shall be
cancelled. Notwithstanding anything contained herein to the contrary, the Option
may be exercised in whole or in part and from time to time,  and if exercised in
part, the number of shares of Preferred Stock deliverable to exercise the Option
and the number of Shares to be issued  hereunder shall be adjusted  accordingly,
and this  Option  shall  continue  in full force and effect to the extent not so
exercised,  or, at the request of the Grantee,  a new Option shall be issued for
the remaining number of Shares.

            (b)  In the  event  of  any  change  in the  number  of  issued  and
outstanding  shares  of  common  stock of the  Grantor  by  reason  of any stock
dividend,  subdivision,  merger,  recapitalization,  combination,  conversion or
exchange of shares, or any other change in the corporate or capital structure of
the  Grantor  which would have the effect of  diluting  or  otherwise  adversely
affect the Grantee's  rights and  privileges  under this Option,  the number and
kind of the Shares and the consideration  payable in respect of the Shares shall
be  appropriately  adjusted to restore to the Grantee its rights and  privileges
under the  Option.  Without  limiting  the scope of the  foregoing,  in any such
event,  at the option of the Grantee,  the Option shall  represent  the right to
purchase,  in addition to the number and kind of Shares which the Grantee  would
be entitled to purchase pursuant to the immediately preceding sentence, whatever
securities,  cash or other property the Shares subject to such Option shall have
been converted into or otherwise  exchanged for,  together with any  securities,
cash or other  property which shall have been  distributed  with respect to such
Shares.

            (c)  Adjustments  for  Dilutive  Issues.   Notwithstanding  anything
contained  herein to the  contrary,  the  number of Shares  shall be  subject to
adjustment  if (x) the  number of shares of common  stock of NPI  issuable  upon
conversion of the Preferred  Stock is increased  pursuant to Section 3(g) of the
Certificate of Designations,  Rights and Preferences of the Preferred Stock (the
"Certificate  of  Designation"),  in which  case the  number of Shares  shall be
increased  by a  percentage  equal to the  percentage  increase in the number of
shares of common stock of NPI issuable upon  conversion of the Preferred  Stock,
or (y) the Grantor shall,  with respect to itself,  consummate any of the events
described in Section 3(d), (e), (f) or (g) of the Certificate of Designation, in
which  case the  number of Shares  shall be  increased  in  accordance  with the
provisions of such Sections, applied to the Grantor, mutatis mutandis,  provided
that for purposes hereof the Conversion  Price and Original Issue Price shall be
deemed to be $2.29 per share of common stock of Grantor and the number of Shares
shall be  increased  accordingly.  For  purposes of  illustration  only,  if the
Grantee  invests  $2  million  in NPI at  $12.50  per share of  Preferred  Stock
(160,000 shares of Preferred Stock;  i.e., 873,336 Shares hereunder) and (X) NPI
subsequently  issues additional shares of common stock at $6.25 per share for an
aggregate  consideration  of more than $2  million,  or (Y) the  Grantor  issues
additional  shares  of  common  stock  at  $1.145  per  share  for an  aggregate
consideration  of more than  $2,000,000,  the number of Shares,  in either  such
case, would be increased by an additional 873,336 shares of Grantor.

                                  ARTICLE II
                 REPRESENTATIONS AND WARRANTIES OF THE GRANTEE

            The  Grantee  hereby  represents  and  warrants  to the  Grantor the
following, which representations and warranties shall be true and correct on the
date of this Agreement and on the Option Closing Date:

            SECTION 2.1 Ownership of Shares.  The Grantee is the sole record and
beneficial owner of the Preferred Stock and has good and marketable title to the
Preferred  Stock,  free and clear of any Lien, other than pursuant to the Rights
Agreement.

            SECTION  2.2  Investment  Intent.  With  respect to the Shares to be
received by the Grantee:

                  (i)   The  Shares  have  not  been   registered   under  the
                        Securities  Act of 1933, as amended (the  "Securities
                                                                   ----------
                        Act"),  and  have  not been  registered  or  qualified
                        ---
                        under the  securities  laws of any state of the United
                        States.  Grantee  acknowledges that it has no right to
                        require the Grantor to register  the Shares  under the
                        Securities  Act or to  register  or qualify the Shares
                        under the  securities  laws of any state of the United
                        States,  other than  pursuant to the  Investor  Rights
                        Agreement;

                 (ii)   The  Grantee  agrees  that it will  not,  directly  or
                        indirectly,   offer,   transfer,   sell  or  otherwise
                        dispose of any of the Shares  (or  solicit  any offers
                        to  buy,  purchase  or  otherwise  acquire  any of the
                        Shares),  except in compliance with the Securities Act
                        and the rules and regulations thereunder.  The Grantee
                        further  understands,  acknowledges  and  agrees  that
                        none  of  the  Shares  may  be  transferred,  sold  or
                        otherwise  disposed of unless (x) such  disposition is
                        pursuant to an effective  registration statement under
                        the  Securities  Act,  or (y) the  Grantee  shall have
                        delivered to the Grantor an opinion,  from counsel and
                        in form and substance  reasonably  satisfactory to the
                        Grantor,  to  the  effect  that  such  disposition  is
                        exempt  from  the   provisions  of  Section 5  of  the
                        Securities Act;

                (iii)   The Grantee is acquiring the Shares for its own account,
                        for  investment  purposes only and not with a view to or
                        for sale in connection with any distribution thereof;

                 (iv)   The Grantee must  continue to bear the  economic  risk
                        of  the  investment  in the  Shares  unless  they  are
                        subsequently  registered  under the  Securities Act or
                        an exemption from such  registration is available.  If
                        any of the Shares are disposed of in  accordance  with
                        Rule 144 under the  Securities  Act, the Grantee shall
                        deliver  to the  Grantor  at or  prior  to the time of
                        such  disposition  an executed  copy of  Form 144  (if
                        required by Rule 144) and such other  documentation as
                        the Grantor may reasonably  require in connection with
                        such disposition;

                  (v)   The Grantee  acknowledges  that the market  value of the
                        Shares  will  fluctuate  from  their  value  on the date
                        hereof and, at the time that the Grantee disposes of the
                        Shares, such shares may not be worth such value;

                 (vi)   The  Grantee  has such  knowledge  and  experience  in
                        business  matters  to be able to  evaluate  the merits
                        and risks of an  investment  in the Shares and to make
                        an informed  decision  with respect to its  acceptance
                        of the  Shares.  The  Grantee  has  adequate  means of
                        providing   for  its  current   financial   needs  and
                        contingencies,   is  able  to  bear  the   substantial
                        economic  risks of an  investment in the Shares for an
                        indefinite  period of time,  has no need for liquidity
                        thereof,  and  could  afford  a  complete  loss of the
                        Purchase Price;

                (vii)   The  Grantee  has  had an  opportunity  to  discuss  the
                        business,   operations  and  conditions  (financial  and
                        otherwise)  of the Grantor with  representatives  of the
                        Grantor.  In accepting the Shares on the Option  Closing
                        Date, no oral representations or written representations
                        (other than those  specifically  made  herein) will have
                        been made to the Grantee; and

               (viii)   The Grantee is an "accredited investor", as that term is
                        defined in Regulation D under the Securities Act.

            SECTION 2.3 Legend. The certificate or certificates representing the
Shares shall bear the following legend:

            "THE SHARES  REPRESENTED BY THIS CERTIFICATE MAY NOT BE TRANSFERRED,
            SOLD OR  OTHERWISE  DISPOSED  OF  UNLESS  (A)  SUCH  DISPOSITION  IS
            PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES
            ACT OF  1933,  AS  AMENDED,  OR (B) THE  HOLDER  HEREOF  SHALL  HAVE
            DELIVERED  TO THE COMPANY AN OPINION,  FROM  COUNSEL AND IN FORM AND
            SUBSTANCE REASONABLY SATISFACTORY TO THE COMPANY, TO THE EFFECT THAT
            SUCH  DISPOSITION IS EXEMPT FROM THE PROVISIONS OF SECTION 5 OF THAT
            ACT."

            "THE SHARES  REPRESENTED BY THIS  CERTIFICATE ARE SUBJECT TO CERTAIN
            REGISTRATION RIGHTS AND RESTRICTIONS ON TRANSFER, AS SET FORTH IN AN
            INVESTOR RIGHTS AGREEMENT BETWEEN THE ISSUER AND THE ORIGINAL HOLDER
            OF  THIS  CERTIFICATE,  A  COPY  OF  WHICH  MAY BE  OBTAINED  AT THE
            PRINCIPAL  OFFICE OF THE  ISSUER.  SUCH  TRANSFER  RESTRICTIONS  AND
            MARKET  STANDOFF  PROVISION  ARE  BINDING  ON  TRANSFEREES  OF THESE
            SHARES."

                                 ARTICLE III
                 REPRESENTATIONS AND WARRANTIES OF THE GRANTOR

            Grantor hereby represents and warrants to the Grantee the following,
which  representations  and warranties  shall be true and correct on the date of
this Agreement and on the Option Closing Date:

            SECTION 3.1  Authority.  Grantor is a  corporation  duly  organized,
validly existing and in good standing under the laws of the State of New Jersey.
Grantor has full  corporate  power and  authority  to execute  and deliver  this
Agreement and all documents and instruments  specified  herein, to carry out its
obligations  hereunder and to consummate the transactions  contemplated  hereby.
This Agreement has been duly executed and delivered by the Grantor, and assuming
due authorization,  execution and delivery by the Grantee,  constitutes a legal,
valid and binding obligation of the Grantor,  enforceable against the Grantor in
accordance with its terms.

            SECTION 3.2 No Default.  The execution,  delivery and performance of
this Agreement by the Grantor does not and will not (x) conflict with or violate
Grantor's  Articles of  Incorporation  or By-laws or any law, rule,  regulation,
order, writ, judgment,  injunction, decree, determination or award applicable to
the  Grantor or (y) result in any breach of, or  constitute  a default (or event
which  with the  giving  of  notice or lapse of time,  or both,  would  become a
default)  under,  or  give to  others  any  rights  of  termination,  amendment,
acceleration or cancellation of, any note, bond, mortgage, indenture,  contract,
agreement,  lease, license,  permit,  franchise or other instrument to which the
Grantor is a party.

            SECTION 3.3 Approval of  Transaction.  The execution and delivery of
this Agreement by the Grantor does not, and the performance of this Agreement by
the Grantor will not,  require any  consent,  approval,  authorization  or other
action by, or filing with or notification to, any person,  entity,  governmental
authority or regulatory authority.

            SECTION  3.4  Claims;   Litigation.   No  actions,   suits,  claims,
litigation, arbitration proceedings, administrative proceeding or investigations
are pending or, to the Grantor's knowledge, threatened against the Grantor which
could adversely affect the consummation of this transaction.

            SECTION 3.5 Shares.  The Shares have been duly  authorized and, upon
issuance  therefor in  accordance  with the  provisions  of the Option,  will be
validly issued,  fully paid and non-assessable.  From and after the date hereof,
the Grantor  shall at all times  reserve and keep  available  for issuance  upon
exercise of the Option  such number of its  authorized  but  unissued  shares of
common stock as will be sufficient to permit the exercise in full of the Option.

            SECTION 3.6 No Material Facts Omitted. No representation or warranty
of the Grantor in this  Agreement  contains  any untrue  statement of a material
fact or  omits  to  state a  material  fact  necessary  to make  the  statements
contained herein not misleading.

                                   ARTICLE IV

                               GENERAL PROVISIONS

            SECTION  4.1  Entire  Agreement.  This  Agreement  contains,  and is
intended as, a complete  statement of all of the terms of the  arrangements  and
understandings between the parties with respect to the matters provided for, and
supersedes any previous  agreements and understandings  between the parties with
respect to those matters.

            SECTION 4.2 Governing Law. This Agreement  shall be governed by, and
construed  and  enforced  in  accordance  with the laws of the State of New York
without  regard  to  its  principles  of  conflicts  of  law.  All  actions  and
proceedings  arising out of, or relating to, this  Agreement  shall be heard and
determined  in any state or federal  court  sitting in New York,  New York.  The
undersigned,  by  execution  and  delivery  of  this  Agreement,  expressly  and
irrevocably (i) consents and submits to the personal jurisdiction of any of such
courts in any such  action or  proceeding;  (ii)  consents to the service of any
complaint,  summons,  notice or other  process  relating  to any such  action or
proceeding  by delivery  thereof to such party as set forth in Section 4.3 below
governing  the giving of notices;  and (iii)  waives any claim or defense in any
such action or  proceeding  based on any alleged lack of personal  jurisdiction,
improper  venue  or forum  non  conveniens  or any  similar  basis.  Each of the
undersigned  hereby  waives for himself and itself,  as the case may be, and its
respective  permitted  successors and assigns, the right to trial by jury in any
action or proceeding instituted in connection with this Agreement.

            SECTION 4.3 Notices. All notices and other communications under this
Agreement shall be in writing and shall be hand delivered,  mailed by registered
or certified  mail,  return receipt  requested  (with a copy  simultaneously  by
ordinary mail), or recognized  overnight  delivery service to the parties at the
following  addresses (or to such other address as a party may have  specified by
notice given to the other party pursuant to this provision):

                  If to the Grantor, to:

                  Hidenet Secure Architectures, Inc.
                  103 Medinat Hayehudam Street
                  Hezliya 46733 Israel
                  Attn:  Ron Fussman

                  with a copy to:

                  Herrick, Feinstein LLP
                  Two Park Avenue
                  New York, New York  10016
                  Attention: David Lubin, Esq.

                  If to the Grantee, to:

                  NP Partners, LLC
                  c/o Mark S. Hauser
                  83 Garden Road
                  Scarsdale, NY 10583

                  with a copy to:

                  Morrison Cohen Singer & Winston, LLP
                  750 Lexington Avenue
                  New York, New York 10022
                  Attention: Stephen Budow, Esq.



<PAGE>



            Each such  notice  shall be deemed  given at the time  delivered  by
hand, if personally  delivered;  five business days after being deposited in the
mail,  postage  prepaid,  if  mailed;  and the next  business  day after  timely
delivery to the courier,  if sent by  overnight  air courier  guaranteeing  next
business day delivery.

            SECTION 4.4 Amendment; Waiver. No provision of this Agreement may be
amended or modified  except by an instrument or instruments in writing signed by
the parties  hereto.  No waiver of any provision  hereof shall be construed as a
waiver of any other provision. Any waiver must be in writing.

            SECTION  4.5  Assignment  and  Binding  Effect.  None of the parties
hereto may assign any of its  rights or  delegate  any of its duties  under this
Agreement without the prior written consent of the others.  This Agreement shall
be binding on, and shall  inure to the benefit of, the parties  hereto and their
successors and assigns.

            SECTION 4.6 No Benefit to Others. The  representations,  warranties,
covenants and agreements contained in this Agreement are for the sole benefit of
the parties  hereto and their  respective  successors and assigns and they shall
not be construed as conferring  and are not intended to confer any rights on any
other persons.

            SECTION 4.7 Further Assurances.  From and after the date hereof, the
Grantor and the Grantee agree to execute and deliver such further  documents and
instruments  and to do such other  acts and things any of them,  as the case may
be, may reasonably request in order to effectuate the transactions  contemplated
by this Agreement.

            SECTION  4.8  Counterparts.   This  Agreement  may  be  executed  in
counterparts,  each of which shall be deemed an original, and each party thereto
may become a party hereto by executing a counterpart  hereof. This Agreement and
any counterpart so executed shall be deemed to be one and the same instrument.

                  [Remainder of Page Intentionally Omitted;
                             Signatures to Follow]


<PAGE>



            IN WITNESS  WHEREOF,  the parties hereto have executed and delivered
this Stock Option Agreement as of the date first written above.

                              HIDENET SECURE ARCHITECTURES, INC.


                              By: /s/ Ron Fussman
                                  ---------------
                                    Name: Ron Fussman
                                    Title:  President

                              NP PARTNERS, LLC

                                 /s/ Mark S. Hauser
                                 ------------------
                                    Name: Mark S. Hauser
                                    Title: Manager