Electronic Time Stamp Technologies Directly Compared
New white paper on electronic time stamps provides support in selecting the right solutions

DÜSSELDORF, GERMANY
February 26, 2008

The signature and time stamp specialist Authentidate has published a comprehensive white paper on electronic time stamps.

The paper, which does not center on particular products or manufacturers, provides support in selecting the right solutions for such applications as time stamping patient files in the eHealth sector, long-term archiving, and other compliance-related issues.

It also helps readers and users better assess the security of electronic business processes and improve security by using the optimum signature and/or timestamp technology.

The direct comparison of different technological approaches and their legal impact makes it easy for readers to create their own cost-benefit analyses.

Topics such as the legal framework, technological and organizational requirements for creating and verifying time stamps, and combining signatures and time stamps are explained simply and clearly for newcomers to the area of electronic time stamps.

The white paper is supplemented with practical examples including legally compliant long-term archiving and mass-document recording.

Authentidate International AG is one of the few certification service providers in Germany accredited according to the Signature Law. It has operated its own trust center for many years to comply with the strict requirements of the Signature Law and is thus under constant oversight by the Federal Network Agency.

Authentidate has gained extensive expertise in the German and international signature field through its many years in the industry and countless international customer projects in nearly every sector. Through its numerous innovations the signature and timestamp specialist has had a considerable impact on shaping the signature market and on developing technologies into market standards.

The white paper (only German version) is available for download free of charge at www.authentidate.de

About Authentidate International AG & Authentidate Deutschland GmbH
Authentidate (Düsseldorf) is the inventor of the centralized, qualified mass signature and one of the leading providers within the international signature market. The signature and IT-security specialist has been a pioneer for years and is influencing the signature market with its innovations.

More than 50% of the German health insurance companies and international companies and organizations, such as DPD, EnBw, HAYS, Klinikum Braunschweig, SOLVAY Chemicals und TÜV Rheinland have been using Authentidate signature products successfully for many years.

Authentidate technologies meet the strict requirements of the German Signature Law and the European Signature Directive. Authentidate International AG is accredited certification service provider by the Federal Network Agency and runs a Trust Center in compliance with the German Signature Law.

Authentidate is headquartered in the USA and is today the sole supplier of the United States Postal Service® Electronic Postmark® (USPS® EPM®), a unique service for secure electronic communication in the USA. Authentidate Holding Corp. is listed on the (Nasdaq: ADAT) and at German stock markets (Security Identification Code 893715).

About Authentidate Holding Corp.
Authentidate Holding Corp. (Authentidate®) is a worldwide provider of secure Health Information Exchange and workflow management services.  The company's software and web-based services enable healthcare organizations and other enterprises to increase revenues, improve productivity and reduce costs by eliminating paper and manual work steps from clinical, administrative and other processes and enhancing compliance with regulatory requirements. The web-based services are delivered as Software as a Service (Saas) to customers. These solutions incorporate rules-based electronic forms, intelligent routing, transaction management, electronic signatures, identity credentialing, content authentication and automated audit trails. Both web and fax based communications are integrated into automated and trusted workflow solutions. The company has offices in the United States and Germany. In the United States we offer our patent pending content authentication technology in the form of the United States Postal Service® Electronic Postmark® (EPM).

For more information, visit the company's website at www.authentidate.com

This press release contains forward-looking statements within the meaning of section 27A of the Securities Act of 1933 and section 21E of the Securities Act of 1934. When used in this release, the words "believe," "anticipate," "think," "intend," "plan," "will be," "expect," and similar expressions identify such forward-looking statements. Such statements regarding future events and/or the future financial performance of the Company are subject to certain risks and uncertainties, which could cause actual events or the actual future results of the Company to differ materially from any forward-looking statement. Such risks and uncertainties include, among other things, the availability of any needed financing, the Company's ability to implement its business plan for various applications of its technologies, related decisions by the USPS, the impact of competition, the management of growth, and the other risks and uncertainties that may be detailed from time to time in the Company's reports filed with the Securities and Exchange Commission. In light of the significant risks and uncertainties inherent in the forward-looking statements included herein, the inclusion of such statements should not be regarded as a representation by the Company or any other person that the objectives and plans of the Company will be achieved.

Authentidate is a registered trademark of Authentidate Holding Corp.  Inscrybe is a trademark of Authentidate Holding Corp. All other trade names are the property of their respective owners.