| 摘要 |
A mediated RSA cryptographic method and system is provided in which a sender encrypts a message using an encryption exponent e and a public modulus n, and a recipient and a trusted authority cooperate with each other to decrypt the encrypted message by using respective components dU, dT of a decryption exponent. In order to prevent the trusted authority from reading the message in the event that it has access to the recipient decryption exponent components dU, the recipient blinds the encrypted message before passing it to the trusted authority. This blinding is effected by a modulo-n blinding operation using a factor r<e >where r is a secret random number. The trusted authority then applies its decryption exponent component dT to the message and returns the result to the recipient who cancels the blinding and applies its decryption exponent component dU. |
