<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>ex23_1.txt
<TEXT>
Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement of
Mitek Systems, Inc. on Form S-2 of our report dated December 29, 2003, appearing
in the Annual Report on Form 10-K of Mitek Systems, Inc. for the year ended
September 30, 2003 and to the reference to us under the heading "Experts" in the
Prospectus, which is part of this Registration Statement.

DELOITTE & TOUCHE LLP
San Diego, California
September 29, 2004

</TEXT>
</DOCUMENT>
