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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Trapdoor Sanitizable Signatures and Their Application to Content Protection
verfasst von : Sébastien Canard, Fabien Laguillaumie, Michel Milhau
Erschienen in: Applied Cryptography and Network Security
Verlag: Springer Berlin Heidelberg
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Sanitizable signatures allow a designated entity to modify some specific parts of a signed message and to produce a new signature of the resulting message without any interaction with the original signer. In this paper, we extend these sanitizable signatures to formally introduce
trapdoor sanitizable signatures
. In this concept, the power of sanitization is given to possibly several entities, for a given message/signature by using a trapdoor computed by the signer at any time. We also give a generic construction of such trapdoor sanitizable signatures. Eventually, we apply our new cryptographic tool to group content protection, permitting members of the group to distribute a protected content among themselves.