Method and apparatus for masking modulo exponentiation calculati

Details Method and apparatus for masking modulo exponentiation calculati Method and apparatus for masking modulo exponentiation calculati

1997-11-12

2000-05-16

Swann, Tod R.

Cryptography

Communication system using cryptography

Symmetric key cryptography

708 7, 708103, 708277, 708490, 708501, 380 44, 380 30, 380264, H04L 900

Patent

active

06064740&

ABSTRACT:
Circuitry which performs modular mathematics to solve the equation C=M.sup.k mod n and n is performed in a manner to mask the exponent k's signature from timing or power monitoring attacks. The modular exponentation function is performed in a normalized manner such that binary ones and zeros in the exponent are calculated by being modulo-squared and modulo-multiplied.

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Kocher, Paul C., Cryptanalysis of Diffie-Hellman, RSA, DSS, and Other Systems Using Timing Attacks, Dec. 7, 1995, pp. 1-6.

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