G - Physics – 07 – B
Patent
G - Physics
07
B
G07B 17/02 (2006.01) G07B 17/00 (2006.01) H04L 9/32 (2006.01)
Patent
CA 2222662
A method for controlling keys used in the verification of encoded information generated by a transaction evidencing device and printed on a document comprises the steps of generating a plurality of random verifier master keys to obtain a set of verifier master keys consisting of a fixed number of keys; generating at least one pointer by applying a psuedorandom algorithm to data unique to the transaction evidencing device ; calculating a plurality of verifier token keys to obtain a verifier token key set corresponding to the set of verifier master keys; encrypting the verifier token key set with a privacy key; and distributing the set verifier token keys and the privacy key to verifiers. The token keys are a function of the verifier master keys and a code valid for a limited time. The pointer algorithm is an appropriate symmetric key cryptographic algorithm and the code is function of a date dependent parameter. The master keys are distributed to postal and vendor data centers.
Cordery Robert A.
Lee David K.
Pauly Steven J.
Pintsov Leon A.
Ryan Frederick W. Jr.
Pitney Bowes Inc.
Sim & Mcburney
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