Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1993-09-07
1994-12-27
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 25, H04K 100
Patent
active
053772687
ABSTRACT:
A metering system requires a user to provide periodic, accurate meter readings to a billing authority.
The metering system includes a mechanism for dispensing postage or another accountable quantity, an accounting mechanism for updating and storing information regarding the amount of postage dispensed by the dispensing mechanism and an output mechanism for outputting the storing postage information. The system also includes a mechanism for storing a time deadline, a clock that provides a current date signal and a lock that disables the dispensing mechanism when the current date is not before the stored deadline. The system also includes a reset mechanism for extending the stored deadline.
A user of the system reads the output of the system to obtain a current meter reading. The user then telephones the billing authority's data center, provides the current reading to the data center and receives back from the center an encrypted combination that reflects the reading provided by the user. The user enters the combination into the system. The meter decrypts the combination and verifies that the reading provided by the user matches the stored postage information. The meter then extends the stored deadline.
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Cain David C.
Parks, Jr. Charles G.
Pitney Bowes Inc.
Scholnick Melvin J.
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