ECDSA-Verifiable Signcryption Scheme with Signature Verification on the Signcrypted Message

Authors:
Raylin Tso;Takeshi Okamoto;Eiji Okamoto
Affiliations:
Department of Risk Engineering Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Japan 305-8573;Department of Risk Engineering Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Japan 305-8573;Department of Risk Engineering Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Japan 305-8573
Venue:
Information Security and Cryptology
Year:
2007

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Abstract

In this paper, we propose a signcryption scheme which provides all the following properties at the same time. (1) forward security: the private key of a sender does not help any attack to break the confidentiality of any signcrypted message generated by the sender. (2) signature verification on the signcrypted message: this is done without revealing the original message. (3) a standardized signature mechanism: in our scheme, both the non-repudiation of the message and the signcrypted message can be done using the standardized digital signature algorithm; ECDSA. The efficiency and features of our scheme are compared with other schemes and the security is proved in the random oracle model.