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Isolation of Cryptographic Functions via Operation Sub Sets Disclosure Number: IPCOM000052564D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11

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Lennon, RE Matyas, SM [+details]


A technique is disclosed by which, with one master key installed in a cryptographic facility, n-number of sets of cryptographic operations can be defined with each set being totally independent of any other set. This is accomplished by deriving n-number of "alternate master keys" derived from a single master key stored in the protected memory of a cryptographic facility and involves performing a specific permutation of the bits of the master key in response to a cryptographic operation before any other logical manipulations of the master key occur. N-number of permutations may be defined, each corresponding to a particular sub-set of operations.