Cryptography – Key management
Reexamination Certificate
2011-06-28
2011-06-28
El Hady, Nabil M (Department: 2434)
Cryptography
Key management
C380S278000, C380S286000, C380S028000, C713S155000, C713S158000
Reexamination Certificate
active
07970141
ABSTRACT:
The present invention relates to a method for traitor tracing. One embodiment of a method for determining at least one traced private key used by a decoder to decrypt an encrypted message includes defining an input ciphertext, the input ciphertext being associated with a tracing private key and having a sublinear size, calling the decoder on the input ciphertext, and associating the tracing private key with a set of traced private keys if the decoder is able to correctly decrypt the encrypted message in accordance with the input ciphertext, the set of traced private keys including at least one private key.
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Matsushita et al., A public-key black-box Traitor Tracing Scheme with Sublinear Ciphertext Size against Self-Defensive Pirates, Advances in Cryptology-ASIACRYPT 2004, Springer-Verlag, 2004.
Boneh Dan
Sahai Amit
Waters Brent
El Hady Nabil M
SRI - International
The Board of Trustees of the Leland Stanford Junior University
The Regents of the University of California
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