FIRST AMENDMENT TO SECURED CONVERTIBLE PROMISSORY NOTE,

Exhibit 4.13

FIRST AMENDMENT TO

SECURED CONVERTIBLE PROMISSORY NOTE

This First Amendment to Secured Convertible Promissory Note (this “ First Amendment ”) is dated as of December 31, 2005, and entered into by and between SAFLINK Corporation, a Delaware corporation (the “ Company ”), and the undersigned holder (“ Holder ”).

RECITALS

A.     SSP Solutions, Inc., a Delaware corporation (“ SSP ”), issued to Holder that certain Secured Convertible Promissory Note, dated November 19, 2003, in the principal amount of $1,250,000.00 (the “ Note ”).

B.     The Company assumed the Note in connection with its acquisition of SSP on August 6, 2004.

C.     The Company and Holder desire to amend the Note by this First Amendment to extend the Note Maturity Date (as defined in the Note) such that the unpaid principal and any unpaid and accrued interest are due and payable by the Company on the earlier of (i) December 31, 2006, or (ii) upon demand on or after the date of the closing of any strategic or financing transaction that g