Method and apparatus for the reliable authentication of...

H - Electricity – 04 – K

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H04K 1/00 (2006.01) G07B 17/00 (2006.01) H04L 9/08 (2006.01) H04L 9/28 (2006.01) H04L 9/32 (2006.01) G06F 7/72 (2006.01) H04L 9/30 (2006.01)

Patent

CA 2056935

A method and system for authentication of communications. More particularly the subject application discloses a method and apparatus whereby a third party may validate that a communication is an authentic communication from a second party sent with the authorization of a first party. For example, the third party may be a postal service, the second party may be a mailer, and the communication may be a postal indicia showing that a mail piece has been properly franked. The first party and the second party share an encryption key, or a series of keys. The first party also has a second encryption key which the third party has the ability to decrypted. In the subject invention the first party encrypts a key shared with the second party with the first party's second key and transmits this to the second party. The second party then uses its copy of the key to encrypt information and appends its encrypted information to the message received from the first party and transmits all this to the third party. The third party may then decrypt the copy of the key encrypted by the first party and use this information to decrypt the information encrypted by the second party. The known technique of eliptical logarithms may be used to provide highly secure encryption of short messages. The second party may be a mailer and the apparatus of the subject invention may include a postage meter which prints the information transmitted to the third party, who may be a postal service, on a mail piece as a postal indicia.

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