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THE SECURITIES REPRESENTED BY THIS INSTRUMENT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR QUALIFIED UNDER APPLICABLE
STATE SECURITIES LAWS AND HAVE BEEN ACQUIRED FOR INVESTMENT PURPOSES ONLY AND
NOT WITH A VIEW TO OR FOR SALE IN CONNECTION WITH ANY DISTRIBUTION THEREOF. THE
SECURITIES MAY NOT BE SOLD, ASSIGNED OR OTHERWISE TRANSFERRED UNLESS THEY ARE
REGISTERED UNDER THE ACT AND ANY APPLICABLE STATE SECURITIES LAWS OR THE
CORPORATION RECEIVES AN OPINION OF COUNSEL FOR THE HOLDER, CONCURRED IN BY
COUNSEL FOR THE COMPANY, THAT SUCH REGISTRATION AND QUALIFICATION ARE NOT
REQUIRED.

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                               SENSAR CORPORATION

                             STOCK PURCHASE WARRANT

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               Warrant to Purchase 212,500 Shares of Common Stock

     For value received, Sensar Corporation, a Nevada corporation (the
"COMPANY"), grants to Brookstreet Securities Corporation (the "HOLDER") the
right, subject to the terms of this Warrant, to purchase at any time during the
period commencing on the Effective Time (as defined below) and ending on the
Expiration Date (as defined below), 212,500 fully paid and nonassessable shares
(the "Shares") of Common Stock, $.001 par value, of the Company at $0.50 per
share (the "EXERCISE PRICE"). The "EFFECTIVE TIME" shall mean the time at which
a merger involving the Company or a wholly-owned subsidiary of the Company and
VitalStream, Inc. becomes effective. The "EXPIRATION DATE" shall be the eighteen
month anniversary of the Effective Time.

     This Warrant is nontransferable (except as provided in Section 8(e)) and
may be exercised for all or any part of the Shares. The number of Shares that
may be purchased are subject to adjustment under the terms of this Warrant.

     1.   EXERCISE OF WARRANT.

          (a) Unless terminated earlier under Section 7, the purchase rights
represented by this Warrant are exercisable by the Holder, in whole or in part,
at any time after the Effective Time and before the close of business on the
Expiration Date, by the surrender of this Warrant and the Notice of Exercise
annexed hereto duly executed at the principal executive office of the Company
(or such other office or agency of the Company as it may designate by notice in
writing to the Holder at the address of the Holder appearing on the books of the
Company), and upon payment of the Exercise Price of the Shares thereby purchased
(by cash or by check or bank draft payable to the order of the Company in an
amount equal to the Exercise Price of the Shares thereby purchased), whereupon
the Holder shall be entitled to receive a certificate for the number of Shares
so purchased. The Company agrees that if at the time of the surrender of this

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Warrant and purchase of the Shares, the Holder shall be entitled to exercise
this Warrant, the Shares so purchased shall be deemed to be issued to such
holder as the record owner of such Shares as of the close of business on the
date on which this Warrant shall have been exercised as aforesaid.

          (b) Certificates for Shares purchased hereunder shall be delivered to
the Holder within a reasonable time after the date on which this Warrant shall
have been exercised as aforesaid.

          (c) The Company covenants that all Shares that may be issued upon the
exercise of rights represented by this Warrant will, upon exercise of the rights
represented by this Warrant, be fully paid and nonassessable and free from all
taxes, liens and charges in respect of the issue thereof (other than taxes in
respect of any transfer occurring contemporaneously with such issue).

     2.   NO FRACTIONAL SHARES OR SCRIP. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise of this
Warrant. With respect to any fraction of a share called for upon the exercise of
this Warrant, an amount equal to such fraction multiplied by the then current
price at which each Share may be purchased hereunder shall be paid in cash to
the Holder.

     3.   CHARGES, TAXES AND EXPENSES. Issuance of certificates for Shares upon
the exercise of this Warrant shall be made without charge to the holder hereof
for any issue or transfer tax or other incidental expense in respect of the
issuance of such certificate, all of which taxes and expenses shall be paid by
the Company, and such certificates shall be issued in the name of the Holder.

     4.   NO RIGHTS AS STOCKHOLDERS. This Warrant does not entitle the Holder to
any voting rights or other rights as a stockholder of the Company prior to the
exercise thereof.

     5.   LOSS, THEFT, DESTRUCTION OR MUTILATION OF WARRANT. Upon receipt by the
Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it, and upon
reimbursement to the Company of all reasonable expenses incidental thereto, and
upon surrender and cancellation of this Warrant, if mutilated, the Company will
make and deliver a new Warrant of like tenor and dated as of such cancellation,
in lieu of this Warrant.

     6.   SATURDAYS, SUNDAYS, HOLIDAYS, ETC. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday or a Sunday or shall be a legal holiday, then such
action may be taken or such right may be exercised on the next succeeding day
not a legal holiday.

     7.   EARLY TERMINATION AND ADJUSTMENTS.

          (a) EARLY TERMINATION ON MERGER, ETC. If at any time the Company
proposes to merge with or into any other corporation, effect a reorganization,
or sell or convey all or substantially all of its assets to any other entity in
a transaction in which the stockholders of the Company immediately before the
transaction own immediately after the transaction less than a

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majority of the outstanding voting securities of the surviving entity (or its
parent), then the Company shall give the Holder twenty (20) days notice of the
proposed effective date of the transaction and, if the Warrant has not been
exercised by the effective date of the transaction, the Warrant shall terminate.
Notwithstanding the foregoing, this Section 7(a) shall not apply to a merger
between the Company or a wholly-owned subsidiary of the Company and VitalStream,
Inc.

          (b) RECLASSIFICATION, ETC. If the Company should, at any time while
this Warrant, or any portion hereof, remains outstanding and unexpired, by
reclassification of securities or otherwise, change any of the securities as to
which purchase rights under this Warrant exist into the same or a different
class or classes, the number of shares of Common Stock for which this Warrant
may be exercised shall continue to be the same.

          (c) SPLIT, SUBDIVISION OR COMBINATION OF SHARES. If the outstanding
shares of the Company's Common Stock are divided into a greater number of
shares, the number of shares of Common Stock purchasable upon the exercise of
this Warrant shall be proportionately increased and the Exercise Price per share
shall be proportionately reduced. Conversely, if the outstanding shares of
Common Stock are combined into a smaller number of shares of Common Stock, the
number of shares of Common Stock purchasable upon the exercise of this Warrant
shall be proportionately reduced and the Exercise Price per share shall be
proportionately increased. The increases and reductions provided for in this
Section 7(c) shall be made with the intent and, as nearly as practicable, the
effect that neither the percentage of the total equity of the Company obtainable
on exercise of this Warrant nor the aggregate price payable for such percentage
shall be affected by any event described in this Section 7(c).

          (d) CASH DISTRIBUTIONS. No adjustment on account of cash dividends or
interest on the Shares or other securities purchasable hereunder will be made to
the Exercise Price under this Warrant.

          (e) NOTICE OF ADJUSTMENT. Whenever an event occurs requiring any
adjustment to be made pursuant to Section 7, upon request of the Holder, the
Company shall promptly file with its Secretary or an assistant secretary at its
principal office and with its stock transfer agent, if any, a certificate of its
Chief Executive Officer or President specifying such adjustment, setting forth
in reasonable detail the acts requiring such adjustment, and stating such other
facts as shall be necessary to show the manner and figures used to compute such
adjustment. Such Chief Executive Officer or President's certificate shall be
made available at all reasonable times for inspection by the Holder.

     8.   MISCELLANEOUS.

          (a) ISSUE DATE. The provisions of this Warrant shall be construed and
shall be given effect in all respects as if it had been issued and delivered by
the Company on the date set forth below. This Warrant shall constitute a
contract under the laws of the state of California and for all purposes shall be
construed in accordance with and governed by the laws of said state.

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          (b) RESTRICTIONS. The Holder acknowledges that the Shares acquired
upon the exercise of this Warrant shall be "restricted securities" as defined in
Rule 144 under the Securities Act of 1933, as amended.

          (c) NOTICE. All notices required or permitted under this Warrant shall
be given in writing and shall be deemed effectively given (a) upon personal
delivery to the party to be notified, (b) three days after deposit with the
United States Post Office, by registered or certified mail, postage prepaid and
addressed to the party to be notified at the address for such party, (c) one day
after deposit with a nationally recognized air courier service such as DHL or
Federal Express, or (d) on the date of facsimile transmission, with confirmed
transmission.

     Addresses for notices:

          If to the Company:

              Sensar Corporation
              One Jenner, Suite 100
              Irvine, California 92618
              Attn: President
              Facsimile: (949) 453-8686

          If to the Holder:

              Brookstreet Securities Corporation
              2361 Campus Drive
              Suite 210
              Irvine, CA 92612
              Attn: President
              Facsimile: (949)852-6806

or such other address as such party may designate by 10 days' advance written
notice to the other party.

          (d) WAIVERS AND AMENDMENTS. This Warrant and any provisions hereof may
be changed, waived, discharged or terminated only by an instrument in writing
signed by the party against which enforcement of the same is sought. This
Warrant shall be binding upon any successors or assigns of the Company.

          (e) ASSIGNMENT AND TRANSFERABILITY. This Warrant may be assigned or
transferred by the Holder only with the prior written approval of the Company.

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     IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officers thereunto duly authorized.

     Dated: April 23, 2002
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                                            SENSAR CORPORATION


                                            By: /s/ Steve Strasser
                                                --------------------------------
                                                Name:  Steve Strasser
                                                Title: President

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                               NOTICE OF EXERCISE

TO:

Sensar Corporation

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     1.   The undersigned hereby elects to purchase ______________ shares of
Common Stock, $.001 par value, of Sensar Corporation (the "SHARES") pursuant to
the terms of the attached Warrant, and tenders herewith payment of the purchase
price in full, together with all applicable transfer taxes, if any.

     2.   Please issue a certificate or certificates representing the Shares in
the name of the undersigned or in such other name as is specified below:


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                                  (Print Name)

               --------------------------------------------------
                                    (Address)

               --------------------------------------------------
                                    (Address)

     3.   The undersigned confirms that the Shares are being acquired for the
account of the undersigned for investment only and not with a view to, or for
resale in connection with, the distribution thereof and that the undersigned has
no present intention of distributing or selling the Shares.


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(Date)                                      (Signature)

                                            ------------------------------------
                                            (Print Name)

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