Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
On-line/off-line digital signatures
CRYPTO '89 Proceedings on Advances in cryptology
Improved Online/Offline Signature Schemes
CRYPTO '01 Proceedings of the 21st 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
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
Efficient Generic On-Line/Off-Line Signatures Without Key Exposure
ACNS '07 Proceedings of the 5th international conference on Applied Cryptography and Network Security
Improved efficiency for CCA-secure cryptosystems built using identity-based encryption
CT-RSA'05 Proceedings of the 2005 international conference on Topics in Cryptology
Efficient identity-based encryption without random oracles
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
New online/offline signature schemes without random oracles
PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
Practical identity-based encryption without random oracles
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
An Efficient Identity-Based Online/Offline Encryption Scheme
ACNS '09 Proceedings of the 7th International Conference on Applied Cryptography and Network Security
Identity-based online/offline key encapsulation and encryption
Proceedings of the 6th ACM Symposium on Information, Computer and Communications Security
Identity-based server-aided decryption
ACISP'11 Proceedings of the 16th Australasian conference on Information security and privacy
Online/offline identity-based signcryption revisited
Inscrypt'10 Proceedings of the 6th international conference on Information security and cryptology
Identity based online/offline encryption and signcryption schemes revisited
InfoSecHiComNet'11 Proceedings of the First international conference on Security aspects in information technology
Exclusion-intersection encryption
International Journal of Security and Networks
Security and Communication Networks
Efficient online/offline signcryption without key exposure
International Journal of Grid and Utility Computing
Server-aided identity-based anonymous broadcast encryption
International Journal of Security and Networks
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We consider a scenario of identity-based encryption (IBE) where the encryption device (such as a smartcard) has low power. To improve the computation efficiency, it is desirable that part of computation can be done prior to knowing the message and the recipient (its identity or public key). The real encryption can be conducted efficiently once the message and the recipient's identity become available. We borrow the notion of online/offline signatures introduced by Even, Goldreich and Micali in 1990 and call this kind of encryption identity-based online/offline encryption(IBOOE), in the sense that the pre-computation is referred to as offline phaseand the real encryption is considered as online phase. We found that this new notion is not trivial, since all previously proposed IBE schemes cannot be separated into online and offline phases so that the online phase is very efficient. However, we also found that with a proper transformation, some existing identity-based encryption schemes can be converted into IBOOE schemes with or without random oracles. We look into two schemes in our study: Boneh-Boyen IBE (Eurocrypt 2004), and Gentry IBE (Eurocrypt 2006).