EXHIBIT 99.1

                CERTIFICATION PURSUANT TO 18 U.S.C. Section 1350

Pursuant to 18 U.S.C. Section 1350, each of the undersigned certifies that this
quarterly report on Form 10-Q for the period ended March 31, 2003 fully complies
with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act
of 1934 and that the information contained in this Report fairly presents, in
all material respects, the financial condition and results of operations of RSA
Security Inc. and its wholly owned subsidiaries.

                                                /s/ ARTHUR W. COVIELLO, JR.
                            ----------------------------------------------------
                                                    ARTHUR W. COVIELLO, JR.
                                         PRESIDENT AND CHIEF EXECUTIVE OFFICER
Dated: May 12, 2003

                                              /s/ JEFFREY D. GLIDDEN
                            ----------------------------------------------------
                                                  JEFFREY D. GLIDDEN
                                  SENIOR VICE PRESIDENT, FINANCE AND OPERATIONS,
                                         CHIEF FINANCIAL OFFICER AND TREASURER

Dated: May 12, 2003

The officers have provided to RSA Security a signed original of this written
statement, as required by Section 906 of the Sarbanes-Oxley Act of 2002. RSA
Security will retain the signed original and will furnish it to the Securities
and Exchange Commission upon its request.