Security system for sstv encryption

Details Security system for sstv encryption Security system for sstv encryption

H - Electricity

04

N

350/20

H04N 7/167 (2006.01)

Patent

CA 1194212

ABSTRACT OF THE DISCLOSURE In a secure communications system, a key number which is changed periodically, e.g. monthly, and a ran- dom number from a random number generator are combined and used as a seed to reset a Pn sequence generator, with the output of the generator being used to control encryption of transmission data in a signal processor. The key is also provided to a first encipherer to en- cipher the random number for transmission with the en- crypted data. At the receiver, the key is provided in common to a deipherer for deiphering the random number and a Pn sequence generator which is periodically reset by the combination of the key and random number in the same manner as in the transmitter. The Pn sequence is then used to decrypt the information. User identifica- tion codes are stored in the transmitter and are used to encipher the key, with each employing its ID code to deipher the key. The user ID codes are known only to the system operator, so that not even a particular user can know the key.

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