Analysis and Enhance of Anonymous Signcryption Scheme

Mingwu Zhang; Yusheng Zhong; Pengcheng Li; Bo Yang

Paper 2009/194

Analysis and Enhance of Anonymous Signcryption Scheme

Mingwu Zhang, Yusheng Zhong, Pengcheng Li, and Bo Yang

Abstract

Ring signcryption, a cryptographic primitive to protect security and privacy, is an encryption and authentication scheme in a single logical step which allows a user to anonymously signcrypt a plaintext on behalf of a group of users that decrypter cannot know who is the actual signcrypter. In 2009, Zhang, Gao, Chen and Geng proposed a novel anonymous signcryption scheme(denoted as the ZGCG scheme) which is more efficient in computational cost and ciphertext length than the related schemes. In this paper, however, we show that the ZGCG scheme has not anonymity secure for the receiver, and then we propose an improved anonymous signcryption scheme that remedies the weakness of the ZGCG scheme. Our proposed scheme satisfies the semantic security, unforgeability, signcrypter identity's ambiguity, and public authenticity. We also give the formal security proof in the random oracle model.

Note: None

Metadata

Available format(s): PDF
Category: Secret-key cryptography
Publication info: Published elsewhere. Prepared to submit to ProSec09
Keywords: digital signatures
Contact author(s): csmwzhang @ gmail com
History: 2009-05-06: received
Short URL: https://ia.cr/2009/194
License: CC BY

BibTeX

@misc{cryptoeprint:2009/194,
      author = {Mingwu Zhang and Yusheng Zhong and Pengcheng Li and Bo Yang},
      title = {Analysis and Enhance of Anonymous Signcryption Scheme},
      howpublished = {Cryptology {ePrint} Archive, Paper 2009/194},
      year = {2009},
      url = {https://eprint.iacr.org/2009/194}
}