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Combination-based broadcast encryption method

  • US 8,897,445 B2
  • Filed: 04/30/2012
  • Issued: 11/25/2014
  • Est. Priority Date: 12/31/2004
  • Status: Active Grant
First Claim
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1. A broadcast encryption method comprising:

  • generating, by a server, a base group through combinations of integers out of a plurality of different integers having values greater than 1, and assigning the base group of different combinations to each user of a plurality of users;

    generating secret information for each user through calculations with key value information allocated to a corresponding user by using the base group allocated to each user as a base, and sending the secret information to each user;

    generating an inverse-base parameter value through calculations with an integer used to produce the base group and key value information of at least one privileged user, and sending the produced inverse-base parameter value to each user, in order for only the at least one privileged user of the plurality of users to eliminate the base group from the secret information; and

    deriving a group key based on the key value information of the privileged users, encrypting a session key with the derived group key and sending the encrypted session key to each user.

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