Exhibit 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 33-80917, 333-05445, 333-49160 and 333-70880) and Form S-8 (No. 333-23933, 333-65894, 333-91337 and 333-97965) of Authentidate Holding Corp of our report dated August 29, 2002 relating to the financial statements and financial statement schedules, which appears in this Form 10-K. PricewaterhouseCoopers LLP Albany, New York September 27, 2002