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Use of duplex - encryption algorithms for satellite channels with verzörgung
Use of duplex - encryption algorithms for satellite channels with verzörgung
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机译:在Verzörgung卫星频道中使用双工加密算法
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摘要
An apparatus and method for ciphering traffic exchanged in both directions between a satellite/cellular telephone and a ground station network using 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. IMAGE
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