An identity-committable signature scheme secure in the standard model
Wei-hua Hou · Procedia Engineering · 2011
Identity-committable signatures (ICS), a new notion introduced by C. K. Chu and W. G. Tzeng in 2007, enable a signer to sign anonymously a message on behalf his organization and to open the identity when he want to expose himself. An identity-committable signature scheme is more efficient and practical than a ring signature scheme for leaking secrets. C. K. Chu and W. G. Tzeng provided the formal definition and security requirements of ICS and presented a concrete scheme based on pairings in the random oracle model. In this paper, we modify slightly the definition of ICS to a independent identity-committable signature scheme without including the regular signatures as in the original definition, so it can avoid organization members been framed as described in the generic ICS construction of Chu and Tzeng. We present an ICS scheme in the standard model, making use of an identity-based signature scheme and a commitment scheme.