Text modifier

Details Text modifier Text modifier

1989-07-07

1991-05-07

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

380 37, 380 42, H04K 900

Patent

active

050143131

ABSTRACT:
A method is disclosed and apparatus is described whereby plain text is modified before it is input to a binary key generator (encryptor). According to the invention, a plain text bit may be modified by a current modifying bit, which in turn, is based on a prior modifying bit, a prior plain text bit, and a prior ciphered text bit. The only data path provided to the transmitter is the encrypted key generator cipher text output. As a result, the only feed-foward path of the plain text to the channel is through the key generator, and thus the fault-immune physical barrier between the plain text and the cipher information inherent with the key generator is maintained. The invention provides a way of utilizing conventional binary key generators to digitally encrypt for radio transmission multilevel sub-band coded speech.

REFERENCES:
patent: 4074066 (1978-02-01), Ehrsam et al.
patent: 4805216 (1989-02-01), Gruenberg
patent: 4815130 (1989-03-01), Lee et al.
patent: 4897876 (1990-01-01), Davies

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