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Cryptographic method for forming modular exponentiation, involves masking operand with random number, and forming modular exponentiation of operand masked by exponent using Montgomery multiplier
Cryptographic method for forming modular exponentiation, involves masking operand with random number, and forming modular exponentiation of operand masked by exponent using Montgomery multiplier
The method involves masking an operand e.g. message to be encrypted, with a random number by multiplying the operand with a parameter including a constant and exponent. A modular exponentiation of the operand masked by an exponent e.g. public or private key, is formed by using a Montgomery multiplier. An exponentiation result e.g. signed message, is unmasked by removing the random number from the exponentiation result. Independent claims are also included for the following: (1) a cryptoprocessor for implementing a cryptographic method (2) a smart card comprising a cryptoprocessor.
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