Cryptography – Key management – Having particular key generator
Patent
1996-10-15
1998-10-20
Cain, David C.
Cryptography
Key management
Having particular key generator
380 50, H04L 900
Patent
active
058258892
ABSTRACT:
An apparatus and method for ciphering traffic exachanged in both directions between a satellite/cellular telephone and a ground station networkusing an orbitial satellite. A buffer memory is provided at either the mobile telephone station or the ground network station or both. The buffer memory is used to store the deciphering bits output from a duplex ciphering algorithm at the time the ciphering bits are generated. The stored ciphering bits are used to decipher a later-to-be-received traffic information block. The delay in using stored deciphering bits is determined for each call at call set-up to the nearest integer number of block periods by measuring the loop propagation delay from the ground station to the mobile telephone station during an exchange of signals at call set-up.
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PCT International Search Report re: PCT/US97/16351 dated Feb. 24, 1998.
Cain David C.
Ericsson Inc.
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