Cryptography – Key management – Having particular key generator
Patent
1993-08-24
1995-01-31
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 23, 380 49, 375 3, 375 4, 379338, 379339, 455 7, 455 14, 455 15, 34082554, H04B 336, H04B 358, H04L 2520, H04L 2552
Patent
active
053864700
ABSTRACT:
A multiport repeater for a local area network installation has (in addition to its conventional functions) means for storing access rules for the items of equipment connected to it. It reads a portion of each frame, which may be all or part of the destination address segment and/or of the source address segment and/or of the control segment of each incoming data frame, or it could be a frame or protocol identifier incorporated in opening bytes of the data segment. It compares the data that it reads with the stored access rules to determine whether the frame is permitted or not. If not, the repeater modifies the frame which it is in the course of re-transmitting, for example by overwriting it with meaningless digits or by encrypting it. It may also report the source address, destination address and reason for deciding to modify the frame to the network controller.
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Carter Steven H.
Gahan Christopher J.
Lockyer Terence D.
3Com Ireland
Gregory Bernarr E.
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