Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
Random oracles are practical: a paradigm for designing efficient protocols
CCS '93 Proceedings of the 1st ACM conference on Computer and communications security
Identity-Based Encryption from the Weil Pairing
CRYPTO '01 Proceedings of the 21st 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
A Practical Public Key Cryptosystem Provably Secure Against Adaptive Chosen Ciphertext Attack
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
Toward Hierarchical Identity-Based Encryption
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: 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
An Identity-Based Signature from Gap Diffie-Hellman Groups
PKC '03 Proceedings of the 6th International Workshop on Theory and Practice in Public Key Cryptography: Public Key Cryptography
Direct chosen ciphertext security from identity-based techniques
Proceedings of the 12th ACM conference on Computer and communications security
Chosen ciphertext secure public key threshold encryption without random oracles
CT-RSA'06 Proceedings of the 2006 The Cryptographers' Track at the RSA conference on Topics in Cryptology
Improved efficiency for CCA-secure cryptosystems built using identity-based encryption
CT-RSA'05 Proceedings of the 2005 international conference on Topics 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
New Construction of Short Hierarchical ID-Based Signature in the Standard Model
Fundamenta Informaticae
New Construction of Short Hierarchical ID-Based Signature in the Standard Model
Fundamenta Informaticae
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A new hierarchical identity based (ID-based) cryptosystem is proposed, including hierarchical identity based encryption (HIBE) and signature (HIBS) schemes. The new HIBE scheme can be proved to be secure without relying on the random oracle model. Then, a new public key encryption (PKE) scheme is constructed based on the new HIBE. It is secure against adaptively chosen ciphertext attacks (IND-CCA) and has many attractive properties, such as efficient key generation, short private key, fast encryption, and etc. Performance of the new PKE scheme is better than all the previous PKE schemes converted from IBE, and is competitive with the best provably secure solutions to date. Furthermore, a new HIBS scheme is also constructed, which shares the same parameters with the new HIBE. The new HIBS scheme is more efficient than the previous HIBS.