Stream cipher cryptographic system and method

Details Stream cipher cryptographic system and method Stream cipher cryptographic system and method

2003-08-19

2010-11-02

Dada, Beemnet W (Department: 2435)

Cryptography

Communication system using cryptography

Time segment interchange

Reexamination Certificate

active

07826613

ABSTRACT:
Apparatus and method for generating a key stream is disclosed. In one embodiment, a cryptographic function is applied on input values selected from a first array of values to generate output values. Mask values are then selected from a second array of values and combined with the output values to generate a key stream block for the key stream. The first and second arrays are finite and may be implemented by a linear feedback shift register.

REFERENCES:
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patent: 6496474 (2002-12-01), Nagatani et al.
patent: 6560212 (2003-05-01), Prasad et al.
patent: 6707914 (2004-03-01), Bell
patent: 2005/0084112 (2005-04-01), Kim et al.
Ekdahl et al. ‘SNOW—a new stream cipher’ Nov. 2001.
Copersmith et al. ‘Cryptanalysis of ciphers with linear masking’ Feb. 2002.

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