Document:

<PAGE>   1
                                                                   Exhibit 10.19

[IMPERIAL BANK LETTERHEAD]

December 15, 1999

Mr. David Wirthlin
Integrated Information Systems, Inc.
1560 West Fountainhead Pkwy, Suite 200
Tempe, AZ 85282

RE: LEASE DOCUMENTS

Dear Mr. Wirthlin:

Imperial Bank Equipment Leasing, a division of Imperial Bank ("Lessor"), is
pleased to present the enclosed Standard Schedule 003 to Master Lease dated
April 8, 1999 and supporting documents to Integrated Information Systems, Inc.
("Lessee") for the lease financing of your equipment acquisition. The following
is a summary of the terms and conditions of the lease:

  LESSEE:                               INTEGRATED INFORMATION SYSTEMS, INC.

  EQUIPMENT:                            COMPUTER EQUIPMENT

  EQUIPMENT ACQUISITION COST:           $600,000.00

  INITIAL BASE LEASE TERM:              30 MONTHS

  MONTHLY RENTAL (Lease Rate Factor):   3.6989%

  SECURITY DEPOSIT:                     EQUAL TO ONE MONTH RENT PLUS APPLICABLE
                                        TAX TO BE APPLIED TO THE LAST INITIAL
                                        MONTH RENT PAYMENT

  DOCUMENTATION FEE:                    0.1% OF EQUIPMENT COST

  END OF TERM OPTIONS:                  FAIR MARKET VALUE

THIS LEASE SCHEDULE IS SUBJECT TO CREDIT APPROVAL AND MUTUALLY ACCEPTABLE LEASE
DOCUMENTATION. Please execute the lease documents by your authorized signature
where indicated and return the original to Imperial Bank along with a check in
the amount of $48,182.64 (refer to Schedule 003 included). If this transaction
is approved and accepted by Imperial Bank, the amount will be applied to your
first and last Initial Term Rent payments plus a documentation fee as indicated
above. If this transaction is not approved and accepted by Imperial Bank for
credit reasons or otherwise, the amount will be promptly returned.

We appreciate this opportunity and look forward to a long-term relationship
with Integrated Information Systems, Inc. If I may be of further assistance,
please feel free to call me toll free at (877) 935-3274, extension 3149.

Sincerely,

/s/ Meghan K. O'Brien

Meghan K. O'Brien
Lease Documentation Specialist

Enclosures

<PAGE>   2
                                SCHEDULE NO. 003
                         DATED AS OF DECEMBER 15, 1999

               A SCHEDULE MADE PURSUANT TO MASTER LEASE AGREEMENT
                           DATED AS OF APRIL 8, 1999,
        BETWEEN IMPERIAL BANK EQUIPMENT LEASING DIVISION, A DIVISION OF
                           IMPERIAL BANK, AS LESSOR,
              AND INTEGRATED INFORMATION SYSTEMS, INC., AS LESSEE

The terms and conditions of this Schedule incorporate the terms and conditions
of the Master Lease Agreement identified above. Capitalized terms not defined
in this Schedule shall have the meanings assigned to them in the Master Lease
Agreement.

I. EQUIPMENT

The Equipment covered by this Schedule is described on Schedule A, attached.

II. ADDRESSES FOR LESSEE AND LESSOR:
<TABLE>
<S>                                            <C>
(A) Lessee's Address(es):
    (1) Chief Executive Office Address:        1560 WEST FOUNTAINHEAD PARKWAY, SUITE 200
                                               TEMPE, ARIZONA 85282

    (2) Lessee's Address to Receive Invoices:  1560 WEST FOUNTAINHEAD PARKWAY, SUITE 200
                                               TEMPE, ARIZONA 85282

        Contact Name:                          DAVID WIRTHLIN, CFO
        Contact Phone Number:                  (602) 470-1630
        Contact Facsimile Number:              (602) 731-3614

    (3) Lessee's Address to Receive Notices:   SAME

        Contact Name:                          SAME
        Contact Phone Number:
        Contact Facsimile Number:

(B) Lessor's Addresses:
    (1) Chief Executive Office:                IMPERIAL BANK EQUIPMENT LEASING DIVISION
                                               9920 SOUTH LA CIENEGA BOULEVARD, SUITE 903
                                               INGLEWOOD, CA 90301

    (2) Address for Payments:                  IMPERIAL BANK EQUIPMENT LEASING DIVISION
                                               PAYMENT PROCESSING
                                               9920 SOUTH LA CIENEGA BOULEVARD, SUITE 903
                                               INGLEWOOD, CA 90301
</TABLE>

<TABLE>
<S>                                     <C>
III. FINANCIAL TERMS

(A) Equipment Acquisition Cost:         $600,000

(B) Equipment Location:                 1560 WEST FOUNTAINHEAD PARKWAY, SUITE 200
                                        TEMPE, ARIZONA 85282

(C) Initial Term (number of months):    30 MONTHS

(D) Initial Term Commencement Date:     1ST DAY OF THE MONTH FOLLOWING ACCEPTANCE DATE
</TABLE>

<PAGE>   3
(E) Lease Rate Factor:        FLOAT TO FUND:
                              THE MONTHLY LEASE RATE FACTOR OF 0.036989 MAY BE
                              ADJUSTED BY 0.00011 FOR EVERY 25 BASIS POINT
                              (0.0025) INCREASE IN THE YIELD OF THE LIKE-TERM
                              U.S. TREASURY NOTE ("T-NOTE"). THE LIKE-TERM
                              T-NOTE IS DEFINED AS THAT SECURITY ISSUED BY THE
                              U.S. DEPARTMENT OF TREASURY WITH A MATURITY MOST
                              CLOSELY MATCHING THE MATURITY OF THE PROPOSED
                              LEASE AS QUOTED IN THE WALL STREET JOURNAL. THE
                              LIKE-TERM T-NOTE RATE FOR THE PURPOSE OF THIS
                              SCHEDULE IS 5.71%. THE MONTHLY LEASE RATE FACTOR
                              SHALL BE FIXED AS OF THE DATE OF FINAL ACCEPTANCE
                              AND WILL REMAIN CONSTANT THROUGHOUT THE TERM OF
                              THE LEASE.

(F) Daily Lease Rate Factor:  0.001233 REFER TO ITEM (F) OF THIS SCHEDULE.

(G) Acceptance Date:          TBD

(H) Lessee's Federal Tax ID:  TBD

(I) Seller:                   VARIOUS

(J) Casualty Value:           SEE MASTER LEASE AGREEMENT PARA VII(c)

(K) Security Deposit:         EQUAL TO ONE MONTH RENT PLUS APPLICABLE TAX TO BE
                              APPLIED TO THE LAST INITIAL MONTH RENT PAYMENT

(L) Purchase Option:          FAIR MARKET VALUE

(M) Documentation Fee:        0.1% OF EQUIPMENT COST

IV. RENT AND TERM

(A) Rent:                     $22,193.40 PLUS APPLICABLE TAX

(B) Due with Documentation:   $48,182.64 = ($22,193.40 RENT + $1,597.92 TAX +
                              $22,193.40 SECURITY DEPOSIT + $1,597.92 TAX + $600
                              DOCUMENTATION FEE)

(C) Rent Due Date:            1ST OF THE MONTH

(D) Rent past due after:      10 DAYS

(E) Late Payment Fee:         1.5%
    (Not to exceed maximum
     rate permitted by
     applicable Law)

(F) Rental Period:            MONTHLY IN ADVANCE

(G) Required Notice:          NO LESS THAN 90 DAYS OR NO MORE THAN 365 DAYS
                              PRIOR TO LEASE TERMINATION

LESSEE, BY THE SIGNATURE BELOW OF ITS AUTHORIZED REPRESENTATIVE, ACKNOWLEDGES
THAT IT HAS READ THIS LEASE, UNDERSTANDS IT, AND AGREES TO BE BOUND BY ITS
TERMS AND CONDITIONS.

LESSOR:    IMPERIAL LEASING                  LESSEE:  INTEGRATED INFORMATION
           A DIVISION OF IMPERIAL BANK                SYSTEMS, INC.

Signature:                                   Signature: /s/ David A. Wirthlin
           ---------------------------                  ---------------------

Name:                                        Name:      David A. Wirthlin
           ---------------------------                  ---------------------

Title:                                       Title:     CFO
           ---------------------------                  ---------------------
<PAGE>   4
                                  SCHEDULE "A"
                         TO EQUIPMENT SCHEDULE NO. 003
                 TO MASTER LEASE AGREEMENT (THE "MASTER LEASE")
                           DATED AS OF APRIL 8, 1999
        BETWEEN IMPERIAL BANK EQUIPMENT LEASING DIVISION, A DIVISION OF
                           IMPERIAL BANK, AS LESSOR,
              AND INTEGRATED INFORMATION SYSTEMS, INC., AS LESSEE

                                 EQUIPMENT LIST

EQUIPMENT DESCRIPTION                   QUANTITY     ESTIMATED COST
---------------------                   --------     --------------

TOTAL COST OF EQUIPMENT                               $600,000.00

LESSOR INITIALS:                        LESSEE INITIALS:        DAW
                 ------------------                      ----------------
<PAGE>   5
                                  SCHEDULE "B"
                         TO EQUIPMENT SCHEDULE NO. 003
                 TO MASTER LEASE AGREEMENT (THE "MASTER LEASE")
                           DATED AS OF APRIL 8, 1999
        BETWEEN IMPERIAL BANK EQUIPMENT LEASING DIVISION, A DIVISION OF
                           IMPERIAL BANK, AS LESSOR,
              AND INTEGRATED INFORMATION SYSTEMS, INC., AS LESSEE

                          EQUIPMENT RETURN PROVISIONS

Upon the expiration or other permitted termination of this Schedule or any
extension thereof, Lessee, at its sole cost, risk, and expense, will return to
Lessor all, (but not less than all), of the Equipment then subject Schedule to
a location in the continental United States specified by Lessor. Lessee shall
be responsible at its sole cost and expense, for (a) the de-installation,
removal and packaging of the Equipment (including, but not limited to, any and
all applicable software, all manuals, maintenance records, maintenance record
jackets, repair orders and all other similar documents) in a manner suitable
for cartage by a common commercial carrier acceptable to Lessor, and (b) the
transportation of the Equipment, upon written notification by Lessor, as to the
date and destination of the shipping. Such Equipment, upon return, shall be
free and clear of all mortgages, liens, security interest, charges, encumbrances
and claims. If Lessor shall so require, Lessee shall provide free and safe
storage, as well as maintain sufficient insurance coverage (as specified in the
Master Lease) for such Equipment for a period not to exceed 120 days from the
expiration date or the last day of any extension period therefor.

Upon return of such Equipment, Lessor or its agent shall inspect the Equipment.
If any item of Equipment is not returned to Lessor, it shall be deemed to be a
casualty and an Event of Loss during the Lease Term. In the event Lessor
determines that repairs, additions or replacements are necessary to place the
Equipment in the same condition as when originally leased to Lessee (reasonable
wear and tear excepted), which at a minimum will require that the Equipment be
in complete and running condition with no missing  or damaged components and
certified as being eligible for the Seller's or the manufacturer's generally
available maintenance contract at then prevailing prices.

If Lessor determines that the Equipment (after inspection) is damaged or worn
beyond normal wear and tear, Lessor or Lessor's agent will prepare an Equipment
Repair Notice ("ERN") which fully describes the repairs and the estimated cost
required to place the Equipment in complete and running condition, and certified
as being eligible for the Seller's or the manufacturer's generally available
maintenance contract. Lessee shall pay such invoiced costs which shall include
an Equipment Inspection Fee equal to one-tenth (.1%) percent of the applicable
Equipment Schedule's "first cost," within ten (10) days of the date of the
Equipment Repair Notice. In the event Lessee fails to remit payment to Lessor
within ten (10) days of receiving such Equipment Repair Notice, Lessee shall pay
to Lessor, interim Rent equal to the Daily Lease Rate Factor, multiplied by the
Equipment Cost as specified in the applicable Schedule, for each day in excess
of Lease Term of the applicable Equipment Schedule, until such payment is made.

At the time of return, the Equipment shall be (I) in compliance with all
applicable federal, state and local laws; and (II) free of all advertising or
insignia thereon by Lessee.

Hold Harmless. Lessee agrees that Lessor will be held harmless for any damages
to disassembly site if Lessee or Lessee's agent causes disassembly.

Insurance on Equipment during return. Lessee will obtain and pay for a policy
of transit insurance for the delivery period in an amount equal to the higher
of Replacement Value or Casualty Value of the Equipment and Lessor shall be
named as loss payee on such policies.

Any further Return Instructions more specifically related to the Equipment (if
applicable) shall be attached as Exhibit "C" Additional Return Provisions.

LESSOR INITIALS:                        LESSEE INITIALS: /s/ DAW
                 ---------------------                   ---------------------
<PAGE>   6
                            INSURANCE AUTHORIZATION

                                                  LEASE DATED: DECEMBER 15, 1999

LESSOR:  IMPERIAL BANK EQUIPMENT LEASING DIVISION, a division of Imperial Bank
ADDRESS: 9920 South La Cienaga Boulevard, Inglewood, California 90301

LESSEE:  INTEGRATED INFORMATION SYSTEMS, INC.
ADDRESS: 1560 WEST FOUNTAINHEAD PKWY, SUITE 200, TEMPE, AZ 85282

EQUIPMENT INFORMATION
NO. of ITEMS DESCRIPTION OF EQUIPMENT (Model, Serial No. etc.)  ESTIMATED COST
                                                                $  600,000.00
               Refer to attached Schedule "A"                   $
                                                                $
                                                            TAX $

EQUIPMENT LOCATION Address (Include County)      ADDITIONAL AMOUNTS (Describe)
1560 WEST FOUNTAINHEAD PKWY, SUITE 200                          $
TEMPE, AZ 85282                                                 $
                                           TOTAL ESTIMATED COST $  600,000.00

TO: INSURANCE AGENT OR BROKER

     We are entering into an Equipment Lease or Lease and Security Agreement to
Master Lease Agreement with Imperial Bank Equipment Leasing Division, a
division of Imperial Bank ("Lessor") for the equipment described above
("Equipment"). The Lease requires us to carry physical damage and third party
liability insurance on the Equipment as described below.

     Please arrange this insurance for our account with insurance companies
rated A or better by A.M. Best Company and immediately send a certificate of
insurance or binder specifically describing all required amounts and
endorsements to:

     IMPERIAL BANK EQUIPMENT LEASING DIVISION, A division of Imperial Bank
    9920 South La Cienaga Boulevard, Suite 903, Inglewood, California 90301
                                Attn: Operations

I. PHYSICAL DAMAGE INSURANCE

     A. All Risks coverage (including earthquake and flood) for the Equipment
in an amount equal to its Total Estimated Cost (to be adjusted to its actual
Total Cost after the Acceptance Date).

     B. Endorsements (1) naming Lessor as an additional insured and loss payee
with respect to the Equipment, (2) providing 30 days' written notice to Lessor
before coverage lapses or is cancelled or materially changed, and (3)
providing that such coverage shall not be rescinded, impaired or invalidated by
any act or neglect of Lessee.

II.  THIRD PARTY LIABILITY INSURANCE

     A. $1,000,000 combined single limit bodily injury and property damage
coverage.

     B. Endorsements (1) naming Lessor as an additional insured with respect to
the Equipment, (2) providing that such coverage is primary as to the Equipment
without right of contribution from any other insurance, (3) providing 30 days'
prior written notice to Lessor before coverage lapses or is cancelled or
materially changed, and (4) providing that such coverage shall not be
rescinded, impaired or invalidated by any act or neglect of Lessee.

Very truly yours,
<TABLE>
<S>                                          <C>
                                              Agent's Name, Address, City, State, Zip, Phone

INTEGRATED INFORMATION SYSTEMS, INC.
------------------------------------------    -----------------------------------------------
PRINT LESSEE'S NAME ABOVE                     AGENT'S NAME

                                              -----------------------------------------------
                                              ADDRESS

By: /s/ David Wirthlin
   ---------------------------------------    -----------------------------------------------
                                              ADDRESS

Printed Name:  David A. Wirthlin              Attn:
              ----------------------------           ----------------------------------------

Title:   CFO                                  Phone:
       -----------------------------------           ----------------------------------------
</TABLE><PAGE>   1
                                                                   Exhibit 10.20

                               INDEMNITY AGREEMENT

         By this INDEMNITY AGREEMENT (this "Agreement"), Integrated Information
Systems, Inc., a Delaware corporation (the "Company"), and the undersigned
officer or member of its Board of Directors ("Indemnitee") warrant, covenant,
and agree as follows:

         WHEREAS, Indemnitee is an officer and/or a member of the Board of
Directors of the Company and in such capacity is performing a valuable service
for the Company; and

         WHEREAS, the Company's Certificate of Incorporation provides for
indemnification of officers and directors to the fullest extent authorized by
the Delaware General Corporation Law; and

         WHEREAS, the Delaware General Corporation Law provides that the
indemnification rights provided thereunder are not exclusive, and that
agreements may be entered into between Company and its officers and the members
of its Board of Directors with respect to indemnification; and

         WHEREAS, in order to induce Indemnitee to serve as an officer or member
of the Board of Directors of the Company, the Company desires to enter into this
contract with Indemnitee;

         NOW, THEREFORE, in consideration of Indemnitee's continued service as
an officer and/or director after the date hereof the parties hereto agree as
follows:

         1. Indemnification of Indemnitee. Subject to Section 2 below, the
Company shall hold harmless and indemnify Indemnitee against any and all
expenses (including attorneys' fees), judgments, fines, and amounts paid in
settlement actually and reasonably incurred by Indemnitee in connection with any
threatened, pending, or completed action, suit, or proceeding, whether, civil,
criminal, administrative, or investigative to which Indemnitee is, was, or at
any time becomes a party, or is threatened to be made a party, by reason of the
fact that Indemnitee is, was, or at any time becomes a director, officer,
employee, or agent of the Company, or is or was serving or at any time serves at
the request of the Company as a director, officer, employee, or agent of another
corporation, partnership, joint venture, trust, or other enterprise, to the
extent currently set forth in the Company's Certificate of Incorporation, a copy
of which is attached hereto as Exhibit A. No amendment or termination of the
Company's Certificate of Incorporation shall affect or terminate the contracted
rights granted to the Indemnitee hereunder.

         2. Limitations on Indemnification. No indemnity pursuant to Section 1
hereof shall be paid by the Company:

                  (a) Except to the extent the aggregate of losses to be
         indemnified hereunder exceeds the amount of losses for which the
         Indemnitee is indemnified pursuant to any policy of insurance purchased
         and maintained by the Company;

                  (b) In respect to remuneration paid to Indemnitee if it shall
         be determined by a final judgment or other final adjudication that such
         remuneration was in violation of law;
<PAGE>   2
                  (c) On account of any suit in which final judgment is rendered
         against Indemnitee or an accounting of profits made from the purchase
         or sale by Indemnitee of securities of the Company pursuant to the
         provisions of Section 16(b) of the Securities Exchange Act of 1934 and
         amendments thereto or similar provisions of any law; or

                  (d) If a final decision by a court having jurisdiction in the
         matter shall determine that such indemnification is not lawful;

         3. Continuation of Indemnification. All obligations of the Company
hereunder shall continue during the period Indemnitee is a director, officer,
employee, or agent of the Company (or is or was serving at the request of the
Company as a director, officer, employee, or agent of another corporation,
partnership, joint venture, trust or other enterprise) and shall continue
thereafter so long as Indemnitee shall be subject to any possible claim or
threatened, pending, or completed action, suit, or proceeding, whether civil,
criminal, or investigative, by reason of the fact that Indemnitee was a director
of the Company or serving in any other capacity referred to herein.

         4. Notification and Defense of Claim. Indemnitee shall promptly notify
the Company of any matter which is or may be the subject of any indemnification
claim hereunder. Promptly after receipt by Indemnitee of notice of the
commencement of any action, suit, or proceeding, Indemnitee will notify the
Company thereof. With respect to any such action, suit, or proceeding:

                  (a) The Company will be entitled to participate therein at its
         own expense;

                  (b) Except as otherwise provided below, to the extent that it
         may wish, the Company jointly with any other indemnifying party may
         assume the defense thereof, with counsel reasonably satisfactory to
         Indemnitee. After notice from the Company to Indemnitee of its election
         so to assume the defense thereof, the Company will not be liable to
         Indemnitee for any legal or other expenses subsequently incurred by
         Indemnitee in connection with the defense thereof other than reasonable
         costs of investigation or as otherwise provided below. Indemnitee shall
         have the right to employ counsel in such action, suit, or proceeding
         but the fees and expenses of such counsel incurred after notice from
         the Company of its assumption of the defense thereof shall be at the
         expense of Indemnitee unless (i) the employment of counsel by
         Indemnitee has been authorized by the Company, (ii) Indemnitee shall
         have reasonably concluded that there may be a material conflict of
         interest between the Company and Indemnitee in the conduct of the
         defense of such action or (iii) the Company shall not in fact have
         employed counsel to assume the defense of such action, in each of which
         cases the fees and expenses of counsel shall be borne by the Company.
         The Company shall not be entitled to assume the defense of any action,
         suit, or proceeding brought by or on behalf of the Company or as to
         which Indemnitee shall have made the determination provided for in (ii)
         above.

                  (c) The Company shall not be liable to indemnify Indemnitee
         under the Agreement for any amounts paid in settlement of any action or
         claim effected without its written consent. The Company shall not
         settle any action or claim in any manner which would impose any
         material penalty or limitation on Indemnitee without Indemnitee's

                                       -2-
<PAGE>   3
         written consent. Neither the Company nor Indemnitee will unreasonably
         withhold its or his consent to any settlement proposed by the other of
         any matter for which indemnity is provided hereunder, including any
         settlement including a penalty or limitation on the Indemnitee.

         5. Prepaid Expenses. The expenses (including attorneys' fees) incurred
by Indemnitee in investigating, defending, or appealing any threatened, pending,
or completed action, suit, or proceeding covered hereunder, whether civil,
criminal, administrative, or investigative, including without limitation any
action by or in the right of the Company (other than expenses to be paid
directly by the Company in assuming the defense of any matter covered hereby
under Section 4(b) hereof), shall be paid in advance by the Company.

         6. Repayment of Expenses. Indemnitee shall reimburse the Company for
all expenses paid by the Company in defending any civil or criminal action,
suit, or proceeding against Indemnitee in the event and only to the extent that
it shall be finally determined that Indemnitee is not entitled to be indemnified
by the Company for such expenses under the Agreement or otherwise.

         7. Other Rights and Remedies. The rights provided by any provision of
this Agreement shall not be deemed exclusive of any other rights to which
Indemnitee may be entitled under any provision of law or of the Company's
Certificate of Incorporation, any Bylaw, this or other agreement, vote of
stockholders or disinterested directors, or otherwise, both as to action in his
official capacity and as to action in another capacity while occupying any of
the positions or having any of the relationships referred to in Section 1 of
this Agreement, and shall continue after Indemnitee has ceased to occupy such
position or have such relationship.

         8. Enforcement. If the Indemnitee is required to bring any action to
enforce rights or to collect monies due under this Agreement and is successful
in such action, the Company shall reimburse Indemnitee for all of Indemnitee's
reasonable fees and expenses in bringing and pursuing such action.

         9. Separability. Each of the provisions of this Agreement is a separate
and distinct agreement and independent of the others, so that if any provision
hereof shall be held to be invalid or unenforceable for any reason, such
invalidity or unenforceability shall not affect the validity or enforceability
of the other provisions hereof.

         10. Miscellaneous. This Agreement shall be interpreted and enforced in
accordance with the laws of Delaware. This Agreement shall be binding upon
Indemnitee and upon Company, its successors and assigns, and shall inure to the
benefit of Indemnitee, his heirs, personal representatives and assigns and to
the benefit of the Company, its successors and assigns. No amendment,
modification, termination or cancellation of this Agreement, other than pursuant
to Section 9, shall be effective unless in writing signed by both parties
hereto.

                                       -3-
<PAGE>   4
         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of               ,         .
   ----------- --  --------

                                  INTEGRATED INFORMATION SYSTEMS, INC.

                                  By:
                                     --------------------------------------
                                  Its:
                                      -------------------------------------

                                  Indemnitee

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

                                       -4-

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