Practical certificateless public key encryption in the standard model

Authors:
Wenjie Yang;Futai Zhang;Limin Shen
Affiliations:
School of Computer Science and Technology, Nanjing Normal University, China;School of Computer Science and Technology, Nanjing Normal University, China, Jiangsu Engineering Research Center on Information Security and Privacy Protection Technology, Nanjing, China;School of Computer Science and Technology, Nanjing Normal University, China, Jiangsu Engineering Research Center on Information Security and Privacy Protection Technology, Nanjing, China
Venue:
NSS'12 Proceedings of the 6th international conference on Network and System Security
Year:
2012

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Abstract

Certificateless public key cryptography was introduced to solve the key escrow problem in identity based cryptography without using public key certificates. In this paper, we investigate certificateless encryption (CLE) scheme whose security does not rely on random oracles. We present a practical CLE scheme which is proved CCA2 secure in the standard model. Our scheme can be regarded as a modification to Zhang et al.'s scheme [5] which has been confirmed insecure against type II adversaries. The newly proposed CLE scheme not only overcomes the security drawbacks of Zhang et al.'s scheme, but also preserves its most distinctive feature of a short public key length. The formal security proof shows that the new scheme is IND-CCA2 secure against Type I and Type II attackers without random oracle under the decisional truncated q-ABDHE assumption and the DBDH assumption, respectively.