Method for the production of an error correction parameter associated with the implementation of modular operations according to the Montgomery method
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United States of America Patent
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May 12, 1998
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N/A
app pub date -
Nov 7, 1995
filing date -
Nov 8, 1994
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Abstract
A method for producing a binary error correction parameter H=2.sup.2*m*k mod N with N being a binary data element, called a modulo, encoded on m words of k bits each. This method includes the following steps: 1. loading of the modulo N into a first n-bit register with n=m*k and initialization of a second n-bit register at B(0)=0 2. production and storage of a data element B(1)=2*(B(0)-N) by bit-by-bit subtraction of B(0) and N, and left shift by one unit of the result, denoted R(0), of the bit-by-bit subtraction, and comparison of B(1) and N, 3. production of a data element H.sub.int =2.sup.n+v mod N with v=(m*k)/2p, with p as an integer by the implementation of the following processing operation: for i as an integer from 1 to v, if B(i)
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