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Method and system for depositing private key used in RSA cryptosystem

  • US 6,072,876 A
  • Filed: 07/25/1997
  • Issued: 06/06/2000
  • Est. Priority Date: 07/26/1996
  • Status: Expired due to Fees
First Claim
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1. A method for depositing a private key used in an RSA cryptosystem, comprising the steps of:

  • dividing a private key of a user into a first partial private key and a second partial private key at a user'"'"'s entity, where the first partial private key is set to be maintained at the user'"'"'s entity;

    depositing the second partial private key from the user'"'"'s entity to another entity;

    delivering the second partial private key from said another entity to the user'"'"'s entity in response to a request from the user'"'"'s entity; and

    composing the first partial private key maintained at the user'"'"'s entity and the second partial private key delivered from said another entity so as to obtain the private key to be used in a processing according to the RSA cryptosystem at the user'"'"'s entity.

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