WiSec '08 Proceedings of the first ACM conference on Wireless network security
Removing Escrow from Identity-Based Encryption
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
Identity-based key issuing without secure channel in a broad area
WISA'06 Proceedings of the 7th international conference on Information security applications: PartI
How to construct identity-based signatures without the key escrow problem
EuroPKI'09 Proceedings of the 6th European conference on Public key infrastructures, services and applications
Efficient identity based ring signature
ACNS'05 Proceedings of the Third international conference on Applied Cryptography and Network Security
Identity based ring signature: why, how and what next
EuroPKI'05 Proceedings of the Second European conference on Public Key Infrastructure
Identity-based encryption: how to decrypt multiple ciphertexts using a single decryption key
Pairing'07 Proceedings of the First international conference on Pairing-Based Cryptography
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In identity-based (ID-based) cryptosystems, a local registration authority (LRA) is responsible for authentication of users while the key generation center (KGC) is responsible for computing and sending the private keys to users and therefore, a secure channel is required. For privacy-oriented applications, it is important to keep in secret whether the private key corresponding to a certain identity has been requested. All of the existing ID-based key issuing schemes have not addressed this anonymity issue. Besides, the separation of duties of LRA and KGC has not been discussed as well. We propose a novel separable and anonymous ID-based key issuing scheme without secure channel. Our protocol supports the separation of duties between LRA and KGC. The private key computed by the KGC can be sent to the user in an encrypted form such that only the legitimate key requester authenticated by LRA can decrypt it, and any eavesdropper cannot know the identity corresponding to the secret key.