Preprocessing scheme for improving Schnorr signature in JavaCard
Shuiguang Deng · Journal of Zhejiang University(Engineering Science) · 2012
The security performance of the Schnorr signature protocol for JavaCard was analyzed in order to enhance security and improve the efficiency.A linear cryptanalysis scheme based on key-recovery attack against the signature protocol was presented,and the feasibility of the attacking method was proved by a case of successful attack.On this basis,a notion of security preprocessing was proposed,which is a linear detection based scheme.The linear detection random numbers and corresponding variables were stored in the special areas of JavaCard.This approach can avoid generation of random number and the complexity modular exponentiation when the digital signature is created in card.Security performance analysis result shows that the proposed scheme not only can promote the operation speed effectively with the same hardware platform and cryptography intensity,but also avoids a type of linear cryptanalysis.