Exhibit 23.1











            Consent of Independent Registered Public Accounting Firm



To the Board of Directors
Transaction Systems Architects, Inc.:


We consent to the incorporation by reference in the registration statement on
Form S-8/A of Transaction Systems Architects, Inc. of our report dated October
25, 2004, with respect to the consolidated balance sheets of Transaction Systems
Architects, Inc., and subsidiaries as of September 30, 2004 and 2003, and the
related consolidated statements of operations, stockholders' equity and
comprehensive income, and cash flows for each of the years in the three-year
period ended September 30, 2004, which report appears in the September 30, 2004
Annual Report to Stockholders on Form 10-K of Transaction Systems Architects,
Inc.


/s/ KPMG LLP

Omaha, Nebraska
May 27, 2005