Multi‐use unidirectional lattice‐based proxy re‐signatures in standard model
Jia Xie, Yupu Hu, Juntao Gao · Security and Communication Networks · 2016
Abstract The first multi‐use unidirectional proxy re‐signature scheme was proposed by Benoît and Damien in 2008, which allowed translating in one direction and can be re‐translated several times. However, constructing multi‐use unidirectional proxy re‐signature scheme where the size of signature and the verification cost did not increase linearly with the number of translations was left as the open problem. This paper presents an efficient multi‐use unidirectional proxy re‐signature scheme and a multi‐use identity‐based unidirectional proxy re‐signature. They are proven secure in the standard model under the small integer solution assumption. And they solve the open problem left in 2008. Moreover, as proxy re‐signature scheme based on the number theory assumptions is no longer secure in quantum era, they are still secure. Copyright © 2017 John Wiley & Sons, Ltd.