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There are many applications in which it is necessary to transmit authenticatable messages while achieving certain privacy goals such as signer ambiguity. The emerging area of vehicular ad-hoc network is a good example application domain with this requirement. The ring signature technique that uses an ad-hoc group of signer identities is a widely used method for generating this type of privacy preserving digital signatures. The identity-based cryptographic techniques do not require certificates.doi:10.1109/seccomw.2006.359554 dblp:conf/securecomm/GamageGCT06 fatcat:xbg4jm4hzbg5pe3nipdpjmfy7y