Text modifier

Details Text modifier Text modifier

1990-11-19

1992-02-04

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

380 43, H04L 902

Patent

active

050864688

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-forward 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

Affiliated with

Also associated with

Rating

Text modifier does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Text modifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Text modifier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-350930