Relationship between a non-malleable commitment scheme and a modified selective decommitment scheme

Authors:
Hai-Xia Xu;Bao Li
Affiliations:
State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, China;State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, China
Venue:
Journal of Computer Science and Technology
Year:
2007

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Abstract

The notion of commitment is one of the most important primitives in cryptography. To meet various needs, there have been many kinds of commitment schemes among which non-malleable commitment scheme and selective decommitment scheme are important and in general use. And, the increasing security demands suggest a closer look at the relationship between the two schemes. For the convenience of our proof, a new definition for selective decommitment scheme is proposed, which is named as modified selective decommitment scheme. The security relation is deduced that a nonmalleable commitment scheme implies a modified selective decommitment scheme, but the reverse is not true.