Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

As independent registered public accountants, we hereby consent to the incorporation by reference in Registration Statement Nos. 333-80567, 333-58032, 333-106843, 333-133765, 333-172810 and 333-172811 on Form S-8 of our report dated December 15, 2011, relating to the financial statements of Mitek Systems, Inc. as of and for the year ended September 30, 2011, included in this Annual Report on Form 10-K for the year ended September 30, 2011.

/s/ Mayer Hoffman McCann P.C.

San Diego, California

December 15, 2011