Cryptography – Key management – Having particular key generator
Patent
1988-03-01
1990-06-12
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 29, 380 49, 34082534, 370 941, H04K 100
Patent
active
049339699
ABSTRACT:
A secure information storage system in which a directory stores identifying titles and pointers to areas of a memory storing respective messages. To protect the messages against unauthorized changes, a MAC (message authentication code) is calculated for them in known manner and stored in a register in a secure unit. This involves processing the whole of each message every time the MAC is checked or, if a message has been changed, a fresh MAC has to be calculated. To avoid this, a separate MAC is calculated for each message and stored in the directory, and a global MAC is calculated for the individual MAC's (treating them as if they were a message) and stored in a secure register. To check a stored message, the global MAC is recalculated (thus verifying the MAC of the message), and the MAC of the message is recalculated (thus verifying the message). If the message is changed, its new MAC and a new global MAC are calculated. The system can be extended to a hierarchy of sub-global MAC's.
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D. W. Davies and W. L. Price, Security for Computer Networks, John Wiley, 1984, pp. 142 and 143.
Marshall Alan D.
Mitchell Christopher J.
Proudler Graeme J.
Buczinski Stephen C.
Gregory Bernarr Earl
Hewlett--Packard Company
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