Random oracles are practical: a paradigm for designing efficient protocols
CCS '93 Proceedings of the 1st ACM conference on Computer and communications security
A Forward-Secure Digital Signature Scheme
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
Identity-Based Encryption from the Weil Pairing
CRYPTO '01 Proceedings of the 21st Annual International Cryptology Conference on Advances in Cryptology
Non-Interactive Zero-Knowledge Proof of Knowledge and Chosen Ciphertext Attack
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
Relations Among Notions of Security for Public-Key Encryption Schemes
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
Short Signatures from the Weil Pairing
ASIACRYPT '01 Proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security: Advances 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
On Quorum Controlled Asymmetric Proxy Re-encryption
PKC '99 Proceedings of the Second International Workshop on Practice and Theory in Public Key Cryptography
Transformation-free proxy cryptosystems and their applications to electronic commerce
InfoSecu '04 Proceedings of the 3rd international conference on Information security
A forward-secure public-key encryption scheme
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Forward-security in private-key cryptography
CT-RSA'03 Proceedings of the 2003 RSA conference on The cryptographers' track
How to construct secure proxy cryptosystem
Information Sciences: an International Journal
A certificate-based proxy cryptosystem with revocable proxy decryption power
INDOCRYPT'07 Proceedings of the cryptology 8th international conference on Progress in cryptology
Certificate-based proxy decryption systems with revocability in the standard model
Information Sciences: an International Journal
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Proxy cryptosystem was first proposed by Mambo and Okamoto, for the delegation of the power to decrypt ciphertexts. However, to our knowledge, there is no reasonable mode aimed at this cryptographic notion. In this paper, we first present a practical mode: proxy cryptosystem based on time segmentation. Under this mode, a secure model is proposed and a proxy cryptosystem is constructed. Our construction uses ideas from the HIBE scheme of Gentry and Silverberg, the FSPE scheme of Canetti et al. and the scheme of Fujisaki and Okamoto, and is proven to be secure based on the hardness of bilinear Diffie-Hellman assumption. At last, we give an identity based (ID-based) version of the proxy cryptosystem based on time segmentation.