Cryptography – Key management – Key distribution
Patent
1999-06-28
2000-05-02
Swann, Tod R.
Cryptography
Key management
Key distribution
380285, 380277, 380278, 380279, 380280, 380281, 380282, 380283, 705401, 705405, 705410, H04L 900
Patent
active
06058193&
ABSTRACT:
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.
REFERENCES:
patent: 4227253 (1980-10-01), Ehrasam et al.
patent: 4238853 (1980-12-01), Ehrsam et al.
patent: 4423287 (1983-12-01), Zeidler
patent: 4649266 (1987-03-01), Eckert
patent: 4725718 (1988-02-01), Sansone
patent: 4743747 (1988-05-01), Fougere
patent: 4757537 (1988-07-01), Edelmann et al.
patent: 4775246 (1988-10-01), Edlemann
patent: 4850017 (1989-07-01), Matyas et al.
patent: 4853961 (1989-08-01), Pastor
patent: 4888800 (1989-12-01), Marshall et al.
patent: 4897875 (1990-01-01), Pollard et al.
patent: 5008827 (1991-04-01), Sansone
patent: 5142577 (1992-08-01), Pastor
patent: 5170044 (1992-12-01), Pastor
patent: 5230020 (1993-07-01), Hardy et al.
patent: 5231666 (1993-07-01), Matyas
patent: 5390251 (1995-02-01), Pastor et al.
patent: 5454038 (1995-09-01), Cordery et al.
patent: 5661803 (1997-08-01), Cordery et al.
patent: 5680456 (1997-10-01), Baker et al.
patent: 5745576 (1998-04-01), Abraham et al.
patent: 5790677 (1998-08-01), Fox et al.
patent: 5812666 (1998-09-01), Baker et al.
patent: 5878136 (1999-03-01), Kim et al.
Cordery Robert A.
Lee David K.
Pauly Steven J.
Pintsov Leon A.
Ryan Jr. Frederick W.
Callahan Paul E.
Malandra, Jr. Charles R.
Melton Michael E.
Pitney Bowes Inc.
Swann Tod R.
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