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...http://www.google.se/patents/US6064740?utm_source=gb-gplus-sharePatent US6064740 - Method and apparatus for masking modulo exponentiation calculations in an integrated circuit
