Key-Insulated Signcryption

Jia Fan (Science and Technology on Communication Security Laboratory, China)

Yuliang Zheng (University of North Carolina at Charlotte, USA)

Xiaohu Tang (Southwest Jiaotong University, China)

Abstract: Signcryption is a public key cryptographic technique that is particularly suited for mobile communications thanks to its light computational and communication overhead. The wide spread use of signcryption in a mobile computing environment, however, is accompanied by an increased risk of private key exposure. This paper addresses the issue of key exposure by proposing a key-insulated signcryption technique. We define a security model for key-insulated signcryption and prove that the keyinsulated signcryption technique is provably secure in the security model.

Keywords: key exposure, key insulation, signcryption

Categories: H.2, H.3.7, H.5.4