Research on Accountability of Perfect Concurrent Signature
Xianhui Lu · Jisuanji gongcheng · 2009
This paper finds that in improved Perfect Concurrent Signature(iPCS) ,the signer can bind multiple messages with one Keystone but let the other signers know only one of the messages,which is unfair for signers. The accountability of Concurrent Signature(CS) is proposed and defined,and an attack case which breaks the accountability in one scheme of Perfect Concurrent Signature(PCS) and an update version of the perfect concurrent signature are proposed,in which the Keystone transfer function takes the exchanged message and Keystone as the input parameters to realize the binding between Keystone and messages. The scheme satisfies the accountability of CS.