Cryptology ePrint Archive: Report 2005/355

ID-based Encryption Scheme Secure against Chosen Ciphertext Attacks

Rongxing Lu and Zhenfu Cao

Abstract: ID-based encryption allows for a sender to encrypt a message to an identity without access to a public key certificate. Based on the bilinear pairing, Boneh and Franklin proposed the first practical ID-based encryption scheme and used the padding technique of Fujisaki-Okamto to extend it to be a chosen ciphertext secure version. In this letter, we would like to use another padding technique to propose a new ID-based encryption scheme secure against chosen ciphertext attacks. The security of our scheme is based on the Gap bilinear Diffie-Hellman assumption in the random oracle model.

Category / Keywords: public-key cryptography / ID-based encryption

Date: received 28 Sep 2005

Contact author: rxlu at cs sjtu edu cn

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Version: 20051009:092536 (All versions of this report)

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