Method and apparatus for efficient irregular synchronization...

Details Method and apparatus for efficient irregular synchronization... Method and apparatus for efficient irregular synchronization...

2005-06-21

2005-06-21

Darrow, Justin T. (Department: 2132)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C380S037000, C380S042000, C380S274000

Reexamination Certificate

active

06909785

ABSTRACT:
A method and apparatus for efficiently synchronizing a stream cipher. State information is transmitted that will allow the intended recipient of the encrypted data stream to set a stream cipher generator to the correct state from which to start generating the stream cipher. A cycle number indicating the current state of a linear feedback shift register and a stutter number indicating whether an output of the linear feedback shift register is dropped are both transmitted to a remote station along with the encrypted data stream.

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The ATM Forum, technical comitte; ATM Security Specification Version 1.0; AF-SEC-0100.001; Feb., 1999.
Kencheng Zeng, “Pseudorandom Bit Generators in Stream-Cipher Cryptography,” Computer, IEEE Computer Society, Long Beach, CA, US, vol. 24, No. 2, Feb. 1, 1991 (pp. 8-17).

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