Dynamic encryption key selection for encrypted radio transmissio

Details Dynamic encryption key selection for encrypted radio transmissio Dynamic encryption key selection for encrypted radio transmissio

1991-04-03

1993-06-22

Swann, Tod

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 43, 380 44, 380 49, H04L 902

Patent

active

052221377

ABSTRACT:
A radio (100) transmits and receives encrypted signals having unencrypted key identifiers, allowing other radios having the corresponding key identifiers and encryption keys to communicate with radio (100). Prior to transmitting an encrypted message, radio (100) selects a unique key identifier automatically and uses the corresponding encryption key to encrypt the message that will be transmitted. Radio (100) transmits the key identifier in an unencrypted format with the encrypted message in order to allow other radios to determine the encryption key used in encrypting the message. When receiving an encrypted message, radio (100) uses the predetermined process stored in the radio (100) to properly select the proper encryption key for use in decrypting the incoming message.

REFERENCES:
patent: 4607137 (1986-08-01), Jansen et al.
patent: 4809327 (1989-02-01), Shima
patent: 4853962 (1989-08-01), Brockman
patent: 4876716 (1989-10-01), Okamoto
patent: 4924513 (1990-05-01), Herbison et al.
patent: 5146498 (1992-09-01), Smith

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