Non-deterministic method for secured data transfer

Cryptography – Communication system using cryptography

Reexamination Certificate

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C380S268000

Reexamination Certificate

active

07116783

ABSTRACT:
A method is provided for secured transfer of data from a first memory containing the data element to a second memory through a data bus that is connected between the first memory and the second memory. According to the method, a secret N-byte data element is transferred byte-by-byte through the data bus, with each byte transiting at least once on the data bus. Before each transfer of a byte of the secret data element, a current index ranging from 0 to N−1 is randomly chosen, with the current index corresponding to a place value of the byte to be transferred. At each transfer of a byte of the secret data element with a place value equal to the current index, a corresponding bit of an N-byte loading indicator is modified as a function of a loading mode, with the loading mode being an integer ranging from 0 to a first constant. The transfer of the secret data element is ended when the loading indicator takes a predetermined value.

REFERENCES:
patent: 5944833 (1999-08-01), Ugon
patent: 6154823 (2000-11-01), Benayon et al.
patent: 6195752 (2001-02-01), Pfab
patent: 6415032 (2002-07-01), Doland
patent: 0809171 (1997-11-01), None
patent: 0908810 (1999-04-01), None
T. Ritter, “Transposition Cipher with Pseudo-Random Shuffling: The Dynamic Transposition Combiner”, 1991, http://www.ciphersbyritter.com/ARTS/DYNTRAN2.HTM, retrieved on Mar. 7, 2005.
French Preliminary Search Report dated Sep. 20, 2000.

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