Cryptography – Key management – Having particular key generator
Patent
1995-01-20
1997-02-18
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 21, 380 46, 380 48, 380 49, H04L 908, H04L 900
Patent
active
056048068
ABSTRACT:
Characteristics of the radio channel are used to establish key sequences for use in encrypting communicated information. These characteristics are the short-term reciprocity and rapid spatial decorrelation of phase of the radio channel. The keys can be established with computations equivalent to a bounded distance decoding procedure, and the decoder used to establish a key may be used for processing the subsequent data transmission. Compared to classical and public-key systems, an alternative mechanism for establishing and sharing key sequences that depends on a physical process is provided in which each party need not generate a pseudorandom quantity because the necessary randomness is provided by the temporal and spatial non-stationarity of the communication channel itself. By using a channel decoder, the probability of two users establishing the same secret key is substantially unity, and the probability of an eavesdropper establishing the same key is substantially zero. Also, the number of possible keys is large enough that finding the correct one by exhaustive search is impractical.
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Chennakeshu Sandeep
Hassan Amer A.
Hershey John E.
Ericsson Inc.
Gregory Bernarr E.
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