### A supplement to Liu et al.'s certificateless signcryption scheme in the standard model

Zhengping Jin, Qiaoyan Wen, and Hua Zhang

##### Abstract

Recently, Liu et al. proposed the first certificateless signcryption scheme without random oracles and proved it was semantically secure in the standard model. However, Selvi et al. launched a fatal attack to its confidentiality by replacing users' public keys, thus pointed out this scheme actually doesn't reach the semantic security as claimed. In this paper, we come up with a rescue scheme based on Liu et al.'s original proposal. A Schnorr-based one-time signature is added to each user's public key, which is used to resist Selvi et al.'s attack. In addition, according to the mistake made in Liu et al.'s security proof, we also show that our improvement is really secure in the standard model under the intractability of the decisional bilinear Diffie-Hellman assumption.

Available format(s)
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
Certificateless cryptographySemantic securitySigncryptionStandard modelProvably secure
Contact author(s)
zhpjin @ yahoo cn
History
Short URL
https://ia.cr/2010/252

CC BY

BibTeX

@misc{cryptoeprint:2010/252,
author = {Zhengping Jin and Qiaoyan Wen and Hua Zhang},
title = {A supplement to Liu et al.'s certificateless signcryption scheme in the standard model},
howpublished = {Cryptology ePrint Archive, Paper 2010/252},
year = {2010},
note = {\url{https://eprint.iacr.org/2010/252}},
url = {https://eprint.iacr.org/2010/252}
}

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