H - Electricity – 04 – K
Patent
H - Electricity
04
K
325/3
H04K 1/00 (2006.01)
Patent
CA 1226904
A method for cryptographic transmission of speech signals and a communication station for performing the method. ABSTRACT In a communication system, in which a great number of communication stations operate on the same telecommu- nication channel, such as a radio frequency, secret information transfer for selective calls as well as group calls in secured by cryptographic transmission of speech signals, in which en- ciphering and deciphering of the speech signals in transmitting and receiving stations, respectively, are performed by means of a secret binary transformation code associated selectively with the speech communication in question. By adding a communication identification signal generated in each participating station as an unambiguous irreversible function of the transformation code to start and stop commands initiating and finalizing, re- spectively, the cryptographic speech transmission from a sending station to one or more receiving stations, as well as to synchronizing signal which may possibly be transmitted during a speech communication and utilizing these communication identification signals as a criterion for initiation and finalization of deciphering of speech signals in the receiving station or stations, a further security is obtained against disturbance or the cryptographic information transfer by third parties through introduction of false messages or commands.
471091
Gowling Lafleur Henderson Llp
S.p. Radio Produktudvikling A/s
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