Direct chosen ciphertext security from identity-based techniques
Proceedings of the 12th ACM conference on Computer and communications security
Chosen-ciphertext secure proxy re-encryption
Proceedings of the 14th ACM conference on Computer and communications security
Identity-Based Proxy Re-encryption
ACNS '07 Proceedings of the 5th international conference on Applied Cryptography and Network Security
Tracing Malicious Proxies in Proxy Re-encryption
Pairing '08 Proceedings of the 2nd international conference on Pairing-Based Cryptography
Type-Based Proxy Re-encryption and Its Construction
INDOCRYPT '08 Proceedings of the 9th International Conference on Cryptology in India: Progress in Cryptology
Chosen-Ciphertext Secure Proxy Re-encryption without Pairings
CANS '08 Proceedings of the 7th International Conference on Cryptology and Network Security
CCA-Secure Proxy Re-encryption without Pairings
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
Conditional proxy re-encryption secure against chosen-ciphertext attack
Proceedings of the 4th International Symposium on Information, Computer, and Communications Security
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
Forward-Secure and searchable broadcast encryption with short ciphertexts and private keys
ASIACRYPT'06 Proceedings of the 12th international conference on Theory and Application of Cryptology and Information Security
Collusion resistant broadcast encryption with short ciphertexts and private keys
CRYPTO'05 Proceedings of the 25th annual international conference on Advances in Cryptology
Proxy re-encryption systems for identity-based encryption
Pairing'07 Proceedings of the First international conference on Pairing-Based Cryptography
Identity-based proxy re-encryption without random oracles
ISC'07 Proceedings of the 10th international conference on Information Security
Efficient Conditional Proxy Re-encryption with Chosen-Ciphertext Security
ISC '09 Proceedings of the 12th International Conference on Information Security
Chosen-ciphertext secure bidirectional proxy re-encryption schemes without pairings
Information Sciences: an International Journal
Interactive conditional proxy re-encryption with fine grain policy
Journal of Systems and Software
Hierarchical conditional proxy re-encryption
Computer Standards & Interfaces
Efficient unidirectional proxy re-encryption
AFRICACRYPT'10 Proceedings of the Third international conference on Cryptology in Africa
Anonymous ID-based proxy re-encryption
ACISP'12 Proceedings of the 17th Australasian conference on Information Security and Privacy
Chosen-ciphertext secure anonymous conditional proxy re-encryption with keyword search
Theoretical Computer Science
On secure data sharing in cloud environment
Proceedings of the 8th International Conference on Ubiquitous Information Management and Communication
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A proxy re-encryption (PRE) scheme supports the delegation of decryption rights via a proxy, who makes the ciphertexts decryptable by the delegatee. PRE is useful in various applications such as encrypted email forwarding. In this paper, we introduce a more generalized notion of conditional proxy broadcast re-encryption (CPBRE). A CPBRE scheme allows Alice to generate a re-encryption key for some condition specified during the encryption, such that the re-encryption power of the proxy is restricted to that condition only. This enables a more fine-grained delegation of decryption right. Moreover, Alice can delegate decryption rights to a set of users at a time. That is, Alice's ciphertexts can be re-broadcasted. This saves a lot of computation and communication cost. We propose a basic CPBRE scheme secure against chosen-plaintext attacks, and its extension which is secure against replayable chosen-ciphertext attacks (RCCA). Both schemes are unidirectional and proved secure in the standard model. Finally, we show that it is easy to get a unidirectional RCCA-secure identity-based proxy re-encryption from our RCCA-secure CPBRE construction.