Cryptanalysis and Improvement of a Multi-Receiver Generalized Signcryption Scheme

Cai-xue Zhou

Paper 2012/638

Cryptanalysis and Improvement of a Multi-Receiver Generalized Signcryption Scheme

Cai-xue Zhou

Abstract

Generalized signcryption (GSC) scheme can adaptively work as an encryption scheme, a signature scheme or a signcryption scheme with only one algorithm. It is very suitable for storage-constrained environments. In this paper, we analyze a multi-receiver GSC scheme, and show that it cannot achieve indistinguishability-adaptive chosen ciphertext attack (IND-CCA2) secure in the pure encryption mode and hybrid encryption mode. We further propose a revised version of the scheme, which resolves the security issues of the original scheme without sacrificing its high efficiency and simple design. Our improved scheme can be proved to be IND-CCA2 secure and existentially unforgeable-adaptive chosen message attack (EUF-CMA) under computational Diffie-Hellman (CDH) assumption.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. no publication
Keywords: public-key cryptography
Contact author(s): charlesjjjx @ 126 com
History: 2012-11-11: received
Short URL: https://ia.cr/2012/638
License: CC BY

BibTeX

@misc{cryptoeprint:2012/638,
      author = {Cai-xue Zhou},
      title = {Cryptanalysis and Improvement of a Multi-Receiver Generalized Signcryption Scheme},
      howpublished = {Cryptology {ePrint} Archive, Paper 2012/638},
      year = {2012},
      url = {https://eprint.iacr.org/2012/638}
}