Actividentity 8-K Changes in Registrant's Certifying Accountant

Exhibit 16

BDO Seidman, LLPAccountants and Consultants One Market - Spear Tower, Suite 1100
San Francisco, California 94105-1011
Telephone: (415) 397-7900Fax: (415) 397-2161

February 19, 2010

Securities and Exchange Commission

100 F Street N.E.

Washington, D.C. 20549

We have been furnished with a copy of the response to Item 4.01 of Form 8-K for the event that occurred on February 19, 2010, to be filed by our former client, ActivIdentity Corporation. We agree with the statements made in response to that Item insofar as they relate to our Firm.

Very truly yours,

/s/ BDO Seidman, LLP

BDO Seidman, LLP