EXHIBIT 32.1 CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Nigel P. Ekern, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Amendment No. 1 to Annual Report of Clarus Corporation on Form 10-K/A for the year ended December 31, 2004, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Amendment No. 1 to Annual Report on Form 10-K/A fairly presents in all material respects the financial condition and results of operations of Clarus Corporation. Date: April 29, 2005 By: /s/ Nigel P. Ekern ------------------------------- Name: Nigel P. Ekern Title: Chief Administrative Officer A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.