Subset difference method for multi-cast rekeying

Details Subset difference method for multi-cast rekeying Subset difference method for multi-cast rekeying

2002-12-13

2008-11-11

Moise, Emmanuel L (Department: 2137)

Cryptography

Key management

C380S273000, C713S163000

Reexamination Certificate

active

07450722

ABSTRACT:
An improved subset-difference method is provided. The improved method uses the value of a current content key to help generate the requisite difference keys. The requisite difference keys are then used to encrypt the next content key which will be delivered only to users who are supposed to remain in the group. Users who have the current content key are then able to generate the requisite difference keys which they can then use to decrypt the next content key. Using the decrypted next content key, the users are then able to continue to receive contents. Since previously revoked users do not have the current content key, they are unable to determine the next content key and thus are prevented from receiving future contents.

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