A digital signature scheme secure against adaptive chosen-message attacks
SIAM Journal on Computing - Special issue on cryptography
CT-RSA '02 Proceedings of the The Cryptographer's Track at the RSA Conference on Topics in Cryptology
Hierarchical ID-Based Cryptography
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Proxy re-signatures: new definitions, algorithms, and applications
Proceedings of the 12th ACM conference on Computer and communications security
Forward-secure signatures with untrusted update
Proceedings of the 13th ACM conference on Computer and communications security
A Forward-Secure Public-Key Encryption Scheme
Journal of Cryptology
Proxy re-signature schemes without random oracles
INDOCRYPT'07 Proceedings of the cryptology 8th international conference on Progress in cryptology
Hierarchical identity based encryption with constant size ciphertext
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Compact group signatures without random oracles
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
Efficient unidirectional proxy re-encryption
AFRICACRYPT'10 Proceedings of the Third international conference on Cryptology in Africa
SPICE: simple privacy-preserving identity-management for cloud environment
ACNS'12 Proceedings of the 10th international conference on Applied Cryptography and Network Security
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This paper studies proxy re-signature schemes. We first classify the expected security notions for proxy re-signature schemes with different properties. We then show how to attack on a recently proposed bidirectional scheme that is purported to be secure without random oracles, and discuss the flaw in their proof. Next, we show how to design a generic unidirectional proxy re-signature scheme using a new primitive called homomorphic compartment signature as the building block. We give a concrete instantiation which yields the first known unidirectional proxy re-signature scheme which is proven secure under standard assumption in the standard model. We also discuss how to incorporate the concept of forward-security into the proxy re-signature paradigm, such that the signing and the transformation are both time-limited.