Efficient Anonymous Fingerprinting with Group Signatures
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Anonymous Fingerprinting with Direct Non-repudiation
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Time-lock Puzzles and Timed-release Crypto
Time-lock Puzzles and Timed-release Crypto
Scalable, Server-Passive, User-Anonymous Timed Release Cryptography
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
Low-cost Anonymous Timed-Release Encryption
IAS '07 Proceedings of the Third International Symposium on Information Assurance and Security
Breaking and repairing trapdoor-free group signature schemes from Asiacrypt'2004
Journal of Computer Science and Technology
Coin-based anonymous fingerprinting
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Time-based release of confidential information in hierarchical settings
ISC'05 Proceedings of the 8th international conference on Information Security
Timed-release encryption with pre-open capability and its application to certified e-mail system
ISC'05 Proceedings of the 8th international conference on Information Security
Efficient and non-interactive timed-release encryption
ICICS'05 Proceedings of the 7th international conference on Information and Communications Security
Timed-release and key-insulated public key encryption
FC'06 Proceedings of the 10th international conference on Financial Cryptography and Data Security
Timed release cryptography from bilinear pairings using hash chains
CMS'06 Proceedings of the 10th IFIP TC-6 TC-11 international conference on Communications and Multimedia Security
Improved anonymous timed-release encryption
ESORICS'07 Proceedings of the 12th European conference on Research in Computer Security
Revisiting the security model for timed-release encryption with pre-open capability
ISC'07 Proceedings of the 10th international conference on Information Security
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Anonymous fingerprinting schemes aim to protect privacy and copyright in the contents delivery services. The schemes protect privacy by enabling buyers to purchase digital goods anonymously unless they redistribute purchased goods. The schemes also protect copyright by enabling the merchant of digital goods to identify the original buyer of a redistributed copy and convince an arbiter of this fact. The key idea of copyright protection is to embed some information which is linkable with the buyer into the contents. This paper presents a new anonymous fingerprinting scheme for a predelivery service where predelivered goods are encrypted by a timed-release encryption scheme so that the buyers can view the contents only after each release date.The major feature of our scheme is to allow the merchant to identify the original buyer of a redistributed ciphertext without decrypting it. Our idea is to force a buyer to attach the embedded information to a purchased ciphertext when the buyer redistributes it before the release date. We call this idea self-enforcing. This paper also proposes two constructions based on previous efficient anonymous fingerprinting schemes. These constructions realize self-enforcing in such a way that the merchant encrypts a purchased copy before encrypting by a timed-release encryption scheme so that the embedded data is needed for decryption. Note that no additional data needs to be sent by the buyer for self-enforcing because data sent by the buyer in the previous schemes is used as an encryption key. This implies efficient countermeasure against redistribution before the release date.