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Method for broadcast encryption and key revocation of stateless receivers

  • US 20050195980A1
  • Filed: 04/28/2005
  • Published: 09/08/2005
  • Est. Priority Date: 01/26/2001
  • Status: Active Grant
First Claim
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1. A method for broadcast encryption, comprising:

  • assigning each user in a group of users respective private information Iu;

    selecting at least one session encryption key K;

    partitioning users not in a revoked set R into disjoint subsets Sil, . . . Sim having associated subset keys Lil, . . . Lim; and

    encrypting the session key K with the subset keys Lil, . . . ,Lim to render m encrypted versions of the session key K.

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