UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                     FORM 15

 Certification and Notice of Termination of Registration under Section 12(g) of
        the Securities Exchange Act of 1934 or Suspension of Duty to File
   Reports Under Section 13 and 15(d) of the Securities Exchange Act of 1934.

                        Commission File Number: 000-25120

                                RSA Security Inc.
                                -----------------

             (Exact name of registrant as specified in its charter)

      174 Middlesex Turnpike, Bedford, Massachusetts 01730, (781) 515-5000
    ----------------------------------------------------------------------
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                          Common Stock, $0.01 par value
- --------------------------------------------------------------------------------
            (Title of each class of securities covered by this Form)

                                      None
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       (Titles of all other classes of securities for which a duty to file
                  reports under section 13(a) or 15(d) remains)

     Please place an X in the box(es) to designate the appropriate rule
provision(s) relied upon to terminate or suspend the duty to file reports:

       Rule 12g-4(a)(1)(i)     / X /             Rule 12h-3(b)(1)(i)      / X /
       Rule 12g-4(a)(1)(ii)    /   /             Rule 12h-3(b)(1)(ii)     /   /
       Rule 12g-4(a)(2)(i)     /   /             Rule 12h-3(b)(2)(i)      /   /
       Rule 12g-4(a)(2)(ii)    /   /             Rule 12h-3(b)(2)(ii)     /   /
                                                 Rule 15d-6               /   /

       Approximate number of holders of record as of the certification or notice
       date: One (1)

     Pursuant to the requirements of the Securities Exchange Act of 1934, RSA
Security Inc. has caused this certification/notice to be signed on its behalf by
the undersigned duly authorized person.

                                            RSA Security Inc.



      Dated: September 15, 2006             By:  /s/ Paul T. Dacier
                                                 -----------------------
                                                 Paul T. Dacier
                                                 President