A randomized protocol for signing contracts
Communications of the ACM
STOC '87 Proceedings of the nineteenth annual ACM symposium on Theory of computing
Asymmetric fingerprinting for larger collusions
Proceedings of the 4th ACM conference on Computer and communications security
Combinatorial Properties and Constructions of Traceability Schemes and Frameproof Codes
SIAM Journal on Discrete Mathematics
Communications of the ACM
Oblivious transfer and polynomial evaluation
STOC '99 Proceedings of the thirty-first annual ACM symposium on Theory of computing
Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Multiparty Computations Ensuring Privacy of Each Party's Input and Correctness of the Result
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
Non-Interactive Oblivious Transfer and Spplications
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
CRYPTO '94 Proceedings of the 14th Annual International Cryptology Conference on Advances in Cryptology
Collusion-Secure Fingerprinting for Digital Data (Extended Abstract)
CRYPTO '95 Proceedings of the 15th Annual International Cryptology Conference on Advances in Cryptology
Proceedings of the First International Workshop on Information Hiding
An Efficient Non-repudiation Protocol
CSFW '97 Proceedings of the 10th IEEE workshop on Computer Security Foundations
Time-lock Puzzles and Timed-release Crypto
Time-lock Puzzles and Timed-release Crypto
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
EUROCRYPT'97 Proceedings of the 16th annual international conference on Theory and application of cryptographic techniques
Threat analysis of online health information system
Proceedings of the 3rd International Conference on PErvasive Technologies Related to Assistive Environments
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Traceability schemes have been proposed as a method to establish copyright protection of broadcast information. With asymmetric traceability, the merchant cannot frame an innocent user, while no user can abuse the system without being detected.We propose an asymmetric solution for traceability, based on the very efficient symmetric scheme of Kurosawa-Desmedt [13]. We do not make any trust assumptions about the broadcasting center or other authorities. Furthermore, we establish anonymity protection for all honest users: the identity of a user is protected, until a "fingerprint" of that user is found on a pirate decoder. We make use of well-known cryptographic techniques, such as oblivious transfer, time-lock puzzles and blind signatures. Finally, we propose a cut-and-choose technique to assure the correctness of the decryption keys.