Multiparty verification in image secret sharing

Abstract

Multiparties in image secret sharing (ISS) need to verify (detect and recognize) each other, which is seldom considered and realized in traditional methods. In this paper, we introduce the definition of multiparty verification. It includes two stages, i.e., a detection stage and a recognition stage, with evaluation methods that are also discussed. A multiparty verification scheme without pixel expansion is developed, which is suitable for both dealer attendance and nonattendance. The classic hash function, public key cryptography and visual cryptography are technically fused in the developed scheme. In the shadow distribution phase, each participant can verify the received shadow using his private key. In the restoration phase, for the case of dealer attendance, he can verify each shadow received using his secret key; for the case of dealer nonattendance, participants can verify each other before exchanging their shadows. We conduct analyses and illustrations to validate the developed scheme.