EXHIBIT 99.2



    CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

         In connection with the Quarterly Report of AUTHENTIDATE HOLDING CORP.
(the "Company") on Form 10-K for the period ending June 30, 2002 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Dennis Bunt, Chief Financial Officer of the Company, certify, pursuant to 18
U.S.C. section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

         (1)      The Report fully complies with the requirements of Section
                  13(a) or 15(d) of the Securities Exchange Act of 1934; and

         (2)      The information contained in the Report fairly presents, in
                  all material respects, the financial condition and result of
                  operations of the Company.



/s/ Dennis Bunt
- -----------------------
Dennis Bunt
Chief Financial Officer
September 30, 2002


                                       76