Security system for SSTV encryption

Details Security system for SSTV encryption Security system for SSTV encryption

1981-11-19

1984-11-20

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2215, 178 2216, 358114, 358122, H04L 902, H04K 102

Patent

active

044840276

ABSTRACT:
In a secure communications system, a key number which is changed periodically, e.g. monthly, and a random 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 encipher the random number for transmission with the encrypted data. At the receiver, the key is provided on common to a decipherer for deciphering 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 identification codes are stored in the transmitter and are used to encipher the key, with each employing its ID code to decipher 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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