An enhanced signcryption protocol for providing forward secrecy 


Vol. 27,  No. 7, pp. 653-663, Jul.  2002


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  Abstract

The signature-then-encryption based on RSA scheme provides forward secrecy, but requires 4 modulo exponentiation operations in total, and the signcryption scheme proposed by Zheng simultaneously fulfills both the functions of digital signature and symmetric key encryption in a logically single step, and with a computational cost significantly smaller than that required by the current standard signature-then-encryption, but it can not provide forward secrecy. In this paper, we propose an enhanced signcryption scheme which can provide forward secrecy with lower computational cost and lower communication overhead comparing with those of the signature-then-encryption based on RSA, and with a similar communication overhead of Zheng's scheme. The proposed scheme can be also easily modified to the direct signature verification scheme by the recipient without using the recipient's private key. Additionally, we suggest a new design protocol with server-supported signatures which solves the CRLs(Certificate Revocation Lists) burden and provides non-repudiation of origin. This protocol with server-supported signatures also can be applied to the original signcryption scheme proposed by Zheng in order to improve security.

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  Cite this article

[IEEE Style]

K. Rhee, H. Cho, J. Lee, "An enhanced signcryption protocol for providing forward secrecy," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 653-663, 2002. DOI: .

[ACM Style]

Kyung-hyune Rhee, Hyun-ho Cho, and Jun-Seok Lee. 2002. An enhanced signcryption protocol for providing forward secrecy. The Journal of Korean Institute of Communications and Information Sciences, 27, 7, (2002), 653-663. DOI: .

[KICS Style]

Kyung-hyune Rhee, Hyun-ho Cho, Jun-Seok Lee, "An enhanced signcryption protocol for providing forward secrecy," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 653-663, 7. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880