<PAGE> 1
Exhibit 23.3
INDEPENDENT AUDITORS' CONSENT
The Board of Directors
S1 Corporation:
We consent to the incorporation by reference in the Post-Effective Amendment
No.2 to the registration statement (No. 333-_____) on Form S-8 of S1
Corporation of our reports dated February 4, 1999, relating to the consolidated
balance sheet of S1 Corporation and subsidiary as of December 31, 1998, and the
related consolidated statements of operations, stockholders' equity and
comprehensive income (loss), and cash flows for each of the years in the
two-year period ended December 31, 1998, and the related financial statement
schedule, which reports appear in the December 31, 1999 annual report on Form
10-K of S1 Corporation.
KPMG LLP
/s/ KPMG LLP
Atlanta, Georgia
September 11, 2000
