Anonymous Certificate-Based Broadcast Encryption With Personalized Messages

摘要: Broadcast encryption with personalized messages (BEPM) is a newly proposed cryptographic primitive, which supports broadcaster to deliver the common encrypted broadcast message group of authorized users. It also individual users simultaneously. However, none existing BEPM schemes consider anonymity users, crucial security requirement for many application scenarios. Besides, previous studies on only achieve against chosen-plaintext attack adversaries. Certificate-based cryptosystem gives viable way construct more secure and efficient schemes. We propose new concept anonymous certificate-based (ANON-CBBE-PM). Subsequently, we illustrate formal definition model ANON-CBBE-PM. Furthermore, present an ANON-CBBE-PM scheme, solves key escrow problem in identity-based certificate management traditional public cryptosystem. Compared schemes, scheme not protects privacy but has advantage performance. To be specific, lengths user secret system parameters, as well cost decryption are constant. For those applications multitude whose computing ability limited, practical. In addition, our simultaneously achieves confidentiality under adaptive chosen-ciphertext standard model.