Title

A Secure Extension of the Kwak-Moon Group Signcryption Scheme

Publication Type

Journal Article

Publication Date

9-2006

Abstract

This paper presents the secure extension of the Kwak–Moon group signcryption scheme [Kwak D, Moon S. Efficient distributed signcryption scheme as group signcryption. In: First applied cryptography and network security – ACNS'03. Lecturer notes in computer science, vol. 2846. Springer Verlag-Verlag; 2003. p. 403–17] as a countermeasure against the cryptanalysis in [Wang G, Deng RH, Kwak D, Moon S. Security analysis of two signcryption scheme. In: Information security conference – ISC 2004. Lecturer notes in computer science, vol. 3225. Springer Verlag-Verlag; 2004. p. 123–33]. The cryptanalysis revealed that the Kwak–Moon scheme cannot satisfy the properties of unforgeability, coalition-resistance, and traceability. Therefore, to avoid these weaknesses, while providing the same functions, we add confidentiality to the original group signature by distributing a shared secret among group members through an efficient group key agreement. However, in case of just combining a group signature and a group key agreement, if an attacker who does not belong to the group acquires a valid group signature, it is still possible for him to impersonate a valid group member and delegate the group. Thus, to avoid this possibility, the proposed scheme confirms whether or not the sender is equal to the signer by including a session key encryption in the signed message. In addition, we analyze the security of the proposed scheme and apply it to an anonymous statistical survey of attributes.

Keywords

Signature, Group signature, Signcryption, Public-key cryptography, Key agreement

Discipline

Information Security

Research Areas

Information Security and Trust

Publication

Computers & Security

Volume

25

Issue

6

First Page

435

Last Page

444

ISSN

0167-4048

Identifier

10.1016/j.cose.2006.05.006

Publisher

Elsevier

Additional URL

http://dx.doi.org/10.1016/j.cose.2006.05.006