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Method for tracing traitor receivers in a broadcast encryption system

  • US 7,010,125 B2
  • Filed: 01/26/2001
  • Issued: 03/07/2006
  • Est. Priority Date: 01/26/2001
  • Status: Expired due to Term
First Claim
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1. A method for identifying disabling at least one traitor receiver with at least one associated unique, compromised decryption key in a broadcast encryption system, comprising:

  • receiving a set of subsets derived from a tree defining leaves, each leaf representing a respective receiver;

    identifying at least one traitor subset from the set of subsets as containing at least one leaf representing a candidate traitor receiver;

    using the traitor subset, undertaking at least one of identifying disabling the traitor receiver; and

    determining whether the traitor subset represents at least two traitor receiver candidates, and if so, dividing the traitor subset into two child sets, wherein the act of identifying or disabling includes encoding plural subsets of the set of subsets with a false key.

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