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Group oriented public key encryption and key management system

  • US 6,530,020 B1
  • Filed: 06/18/1998
  • Issued: 03/04/2003
  • Est. Priority Date: 06/20/1997
  • Status: Expired due to Fees
First Claim
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1. In a computer readable recording medium for recording an encryption method used in a public key encryption system comprising a combination between a first key P and a second key S, said first key P being used in a data conversion for encrypting a plain text, and said second key S being different from said first key P and being used in a data conversion for decrypting a cryptogram to produce a plain text, said recording medium records a program for:

  • generating a group comprising one or more members Mi (i=1 to n);

    generating a group public key PG and a group secret key SG, which are allocated to the group; and

    encrypting one or more encryptions of a group secret key PMi (SG) (i=1 to n) encrypted by executing the data conversion of said group secret key SG by each of public keys PMi specific to said members Mi, wherein said members Mi are each capable of encrypting one or more encryptions of said group secret key, wherein said encrypted group secret keys PMi (SG) are decrypted by a member secret key SMi specific to each of said members Mi to thereby acquire said group secret key SG and said acquired group secret key SG is used to execute a decryption process operation of cryptogram information encrypted by any of said members Mi using said group public key PG.

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