Method and apparatus for key transforms to discriminate between

Details Method and apparatus for key transforms to discriminate between Method and apparatus for key transforms to discriminate between

1994-07-05

1997-01-14

Barr on, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 21, H04N 932, H04N 916

Patent

active

055947956

ABSTRACT:
A method and apparatus is presented for transforming a key variable used for scrambling cellular data traffic between a terminal and a network in alternate ways using information transmitted to the terminal from the network with which the terminal is connected. Transformation is accomplished by passing portions of the key variable through a series of S-boxes which provide a mapping between the input and output. Moreover, it is disclosed how to save memory by iteratively passing portions of the key variable through the same S-box.

REFERENCES:
patent: 4549308 (1985-10-01), LePinto
patent: 5153919 (1992-10-01), Reeds, III et al.
patent: 5309501 (1994-05-01), Kuzik et al.

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