Method of protecting a linear feedback shift register (LFSR) out

Details Method of protecting a linear feedback shift register (LFSR) out Method of protecting a linear feedback shift register (LFSR) out

1990-07-23

1991-10-22

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 50, 36422421, H04L 900

Patent

active

050602659

ABSTRACT:
The present invention discloses a method of protecting a pseudorandom (PN) signal generated by a linear Feedback Shift Register (LFSR) from cryptographic attack. This is accomplished by first receiving a PN output signal generated by an LFSR, or by clocking an LFSR to produce a PN output signal. Thereafter, non-linearity is deterministically introduced into the PN signal to produce a deterministic bit pattern. According to the suggested embodiments, the introduction of non-linearity is accomplished by altering at least one bit of the PN signal sequence. Next, the deterministic bit pattern is substituted in place of the LFSR PN signal, thereby protecting the PN signal from cryptographic attack.

REFERENCES:
patent: 3911330 (1975-10-01), Fletcher et al.
patent: 4755987 (1988-07-01), Lee et al.
patent: 4757532 (1988-07-01), Gilham
patent: 4827514 (1989-05-01), Ziolko et al.
patent: 4893339 (1990-01-01), Bright et al.
patent: 4907271 (1990-03-01), Gilham

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