Sender dynamic, non-repudiable, privacy-preserving and strong secure group communication protocol

摘要: Abstract Establishing a secure communication channel among group of individuals is critical issue in oriented applications. In implementation, besides the basic confidentiality requirement, we also expect communications to be sender dynamic, forward secure, non-repudiable and privacy preserving. Traditional approaches, i.e., key agreement broadcast encryption cannot achieve above requirements simultaneously efficiently. this paper, propose our solution using new security tool called identity based asymmetric protocol with non-reputation privacy. The notion allows users negotiate common their respective decryption keys. After that, inside/outside who have knowledge are able send privacy-preserving messages confidentially. Further, even all users’ private keys later corrupted, broadcasted previously remain secure. Following definition, concrete which proven against chosen-ciphertext attacks (CCA) directly. We show potential applications instant messaging applications, such as Whatsapp, Wechat, Messenger.