Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1996-11-01
1998-09-08
Cain, David
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
H04L 900
Patent
active
058057013
ABSTRACT:
A key control system comprises the generation of a first set of predetermined keys K.sub.pred which are then used as master keys for a plurality of respective postage meters. The keys are then related to a respective meter in accordance with a map or algorithm. The predetermined master key K.sub.pred is encrypted with the date to yield a date dependent key K.sub.dd related to the respective meter. The date dependent key is encrypted with a unique identifier or the respective meter to yield a unique key K.sub.final that is by the respective meter to generate digital tokens. The Data Center encrypts the date with each predetermined key K.sub.pred to yield a table of dependent keys K.sub.dd 's. The table of K.sub.dd 's are distributed to verification sites. The verification site reads a meter's identification from a mailpiece being verified to obtain the dependent key K.sub.dd of the meter. The verification site encrypts the dependent key K.sub.dd with the unique identifier to obtain the unique meter key which is used to verify tokens generated by the meter. In the preferred embodiment, the master key K.sub.pred, the date dependent key K.sub.dd, and the unique key K.sub.final, in the meter are stored in the meter. In an alternate embodiment, the master key K.sub.pred is encrypted with a unique meter identifier to obtain and the unique key K.sub.final which is stored in the meter. The meter then generates its date dependent key.sub.dd, which is used to generate digital tokens.
REFERENCES:
patent: 4757532 (1988-07-01), Gilham
patent: 4853961 (1989-08-01), Pastor
patent: 4893338 (1990-01-01), Pastor
patent: 5696829 (1997-12-01), Cordery et al.
Cain David
Malandra, Jr. Charles R.
Pitney Bowes Inc.
Scolnick Melvin J.
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