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Decryption method and device, and access right authentication method and apparatus

  • US 6,275,936 B1
  • Filed: 10/15/1998
  • Issued: 08/14/2001
  • Est. Priority Date: 10/17/1997
  • Status: Expired due to Term
First Claim
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1. A decryption device that decrypts a cipher text encrypted by RSA method, comprising:

  • a first storage unit that stores a modulus n of a modulus exponentiation operation;

    a second storage unit that stores first decryption information d1;

    a cipher text input unit that inputs a cipher text C;

    an information input unit that inputs second decryption information d2; and

    an operation unit that performs the modulus exponentiation operation in which C is raised to a power, a product of d1 and d2, modulo n and outputs a result of the operation.

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