Threshold Encryption Scheme based on Cocks' IBE Scheme
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Since one of weak points of public crypto-systems is to require the verification of public key, identity based crypto-systems were proposed as an alternative. However, such techniques need a private key generator which can be a single point of failure. To improve such weakness, threshold identity-based crypto-systems were proposed. In this paper, we propose a new threshold identity-based encryption scheme which is constructed to extend an identity-based encryption scheme by Cocks. Since the proposed scheme is based on quadratic residues, it has smaller complexity of encryption. And we prove that the proposed scheme is secure against a chosen identity attack.
Abstract
Since one of weak points of public crypto-systems is to require the verification of public key, identity based crypto-systems were proposed as an alternative. However, such techniques need a private key generator which can be a single point of failure. To improve such weakness, threshold identity-based crypto-systems were proposed. In this paper, we propose a new threshold identity-based encryption scheme which is constructed to extend an identity-based encryption scheme by Cocks. Since the proposed scheme is based on quadratic residues, it has smaller complexity of encryption. And we prove that the proposed scheme is secure against a chosen identity attack.
참고문헌 (9)
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- Waters, B., "Efficient Identity based Encryption without random oracles", LNCS, 3494, pp.114~127 (2005)
- Boneh, D., "Chosen Ciphertext Secure Public Key Threshold Encryption without Random Oracles", LNCS, 3860, pp.226~243 (2006)
- Li, J., "Threshold Identity Based Encryption Scheme without Random Oracles", Proc. WCAN 06 (2006)
- Shoup, V., "Practical threshold signatures", LNCS, 1807, pp.207~220 (2000)