Secure Integration of Asymmetric and Symmetric Encryption Schemes
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
SELS: a secure e-mail list service
Proceedings of the 2005 ACM symposium on Applied computing
Improved proxy re-encryption schemes with applications to secure distributed storage
ACM Transactions on Information and System Security (TISSEC)
ASIACCS '06 Proceedings of the 2006 ACM Symposium on Information, computer and communications security
Attribute-based encryption for fine-grained access control of encrypted data
Proceedings of the 13th ACM conference on Computer and communications security
Ciphertext-Policy Attribute-Based Encryption
SP '07 Proceedings of the 2007 IEEE Symposium on Security and Privacy
Chosen-ciphertext secure proxy re-encryption
Proceedings of the 14th ACM conference on Computer and communications security
Provably Secure Timed-Release Public Key Encryption
ACM Transactions on Information and System Security (TISSEC)
Short Signatures Without Random Oracles and the SDH Assumption in Bilinear Groups
Journal of Cryptology
General Certificateless Encryption and Timed-Release Encryption
SCN '08 Proceedings of the 6th international conference on Security and Cryptography for Networks
Timed-Release Encryption Revisited
ProvSec '08 Proceedings of the 2nd International Conference on Provable Security
General Conversion for Obtaining Strongly Existentially Unforgeable Signatures
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Usable secure mailing lists with untrusted servers
Proceedings of the 8th Symposium on Identity and Trust on the Internet
A Generic Construction of Timed-Release Encryption with Pre-open Capability
IWSEC '09 Proceedings of the 4th International Workshop on Security: Advances in Information and Computer Security
Two-tier signatures, strongly unforgeable signatures, and Fiat-Shamir without random oracles
PKC'07 Proceedings of the 10th international conference on Practice and theory in public-key cryptography
Unidirectional chosen-ciphertext secure proxy re-encryption
PKC'08 Proceedings of the Practice and theory in public key cryptography, 11th international conference on Public key cryptography
Hybrid proxy re-encryption scheme for attribute-based encryption
Inscrypt'09 Proceedings of the 5th international conference on Information security and cryptology
From proxy encryption primitives to a deployable secure-mailing-list solution
ICICS'06 Proceedings of the 8th international conference on Information and Communications Security
A verifiable random function with short proofs and keys
PKC'05 Proceedings of the 8th international conference on Theory and Practice in Public Key Cryptography
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
Practical identity-based encryption without random oracles
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
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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Timed-Release Encryption (TRE) (proposed by May in 1993) prevents even a legitimate recipient decrypting a ciphertext before a semitrusted Time Server (TS) sends trapdoor sT assigned with a release time T of the encryptor's choice. Cathalo et al. (ICICS2005) and Chalkias et al. (ESORICS2007) have already considered encrypting a message intended to multiple recipients with the same release time. These schemes are efficient compared with previous TRE schemes with recipient-to-recipient encryption, since the most costly part (especially pairing computation) has only to be computed once, and this element is used commonly. One drawback of these schemes is the ciphertext size and computational complexity, which depend on the number of recipients N. In this paper, for the first time we propose Timed-Release Proxy Re-Encryption (TR-PRE) scheme. As in PRE, a semi-trusted proxy transforms a ciphertext under a particular public key (this can be regarded as a mailing list) into reencrypted ciphertexts under each recipient (who can be regarded as mailing list members). Even if the proxy transformation is applied to a TRE ciphertext, the release time is still effective. An encryptor can transfer N- dependent computation parts to the proxy. This function can be applied to multicast communication with a release time indication. For example, in an on-line examination, an examiner sends encrypted e-mails to each examinee, and each examination can be fairly opened at the same time. Our TR-PRE scheme is provably secure under both chosen-time period chosen-ciphertext attack (IND-CTCA) and replayable chosen-ciphertext attack (IND-RCCA) without random oracles.