Random keystream generation apparatus and method for use in...

Details Random keystream generation apparatus and method for use in... Random keystream generation apparatus and method for use in...

2006-05-16

2006-05-16

Smithers, Matthew (Department: 2137)

Cryptography

Key management

Having particular key generator

C380S265000, C708S252000

Reexamination Certificate

active

07046803

ABSTRACT:
A random keystream generation apparatus and method for use in an encryption system, generates an m-bit random keystream, using a PS-LFSR with n storage stages for storing n-bit binary data is divided into k sub-storages connected in series, each sub-storage having parallel storage stages (k is a minimum integer larger than the quotient of n divided by m). Each sub-storage stores in the parallel storage stages m-bit parallel binary data received from the previous sub-storage and outputs the m-bit parallel binary data simultaneously in accordance with a system clock signal. A buffer has m storage stages to store m-bit parallel data received from the last sub-storage of the PS-LFSR. M feedback connections receive the outputs of the sub-storages and the buffer corresponding to predetermined primitive polynomials, calculate the primitive polynomials with the received data, and output the calculation results as the bits of the m-bit keystream sequence.

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Popplewell et al., “Architecture for fast encoding and error detection of cyclic codes”, Jun. 1992, IEEE Proceedings-1, vol. 139, No. 3, pp. 340-348.

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