Key production system

Details Key production system Key production system

2011-03-08

2011-03-08

Gergiso, Techane J (Department: 2437)

Cryptography

Key management

Key distribution

C713S186000, C726S026000

Reexamination Certificate

active

07903820

ABSTRACT:
A key production system to determine a cryptographic key for a selected cryptoperiod being later than or equal to a cryptoperiod-A, and earlier than or equal to a different cryptoperiod-B, the system including a first receiver to receive a first key-component, associated with cryptoperiod-A, forming part of a first hash-chain progressing via a first one-way function, progressive key-components corresponding to later cryptoperiods, a second receiver to receive a second key-component, associated with cryptoperiod-B, forming part of a second hash-chain progressing via a second one-way function, progressive key-components corresponding to earlier cryptoperiods, first and second key-component determination modules to determine key-components in the first hash-chain and the second hash-chain, respectively, for the selected cryptoperiod, and a key determination module to determine the cryptographic key based on the key-components in the first and second hash chain for the selected cryptoperiod. Related methods and apparatus are also included.

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