ID-based threshold decryption without random oracles and its application in key escrow

Authors:
Zhenchuan Chai;Zhenfu Cao;Rongxing Lu
Affiliations:
Shanghai Jiao Tong University, Shanghai, P. R. China;Shanghai Jiao Tong University, Shanghai, P. R. China;Shanghai Jiao Tong University, Shanghai, P. R. China
Venue:
InfoSecu '04 Proceedings of the 3rd international conference on Information security
Year:
2004

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Abstract

In this paper, we first present an ID-based threshold decryption scheme ThD based on bilinear Diffie-Hellman inversion assumption, and prove that it is selective chosen plaintext secure without random oracles. Then, we enhance ThD to a more secure level with ciphertext validation test before decryption. At last, we apply ThD to key escrow, resulting in a robust threshold key escrow system.