Method and apparatus for verifying secure document timestamping

Details Method and apparatus for verifying secure document timestamping Method and apparatus for verifying secure document timestamping

2006-09-29

2011-11-01

Abrishamkar, Kaveh (Department: 2431)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C380S243000, C705S051000

Reissue Patent

active

RE042893

ABSTRACT:
According to one embodiment of the invention, a method is provided for receiving a timestamp from a caller via a telephone connection; receiving a device identifier from the caller, in which the device identifier identifies a device; determining a cryptographic key based on the device identifier; determining an indication of a time based on the timestamp and the cryptographic key; providing the indication of the time to the caller; determining an account; and charging a fee to the account.

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