基于多接收者加密算法的可否认环认证协议

可否认的环认证协议允许消息的发送者匿名地认证某消息，而在认证的同时，消息接收方却不能够向第三方揭示此次认证的发生，即消息发送方可以否认该认证。针对这一问题，提出一种新的基于多接收者加密算法的可否认环认证协议。消息接收者运行基于多接收者的加密算法对认证码进行加密，并将结果发送给消息发送方。发送方解密后得到认证码，并利用该认证码对消息进行认证。该协议构造简单，仅需要2轮通信。多接收者加密算法保护了发送者的隐私，且其可否认性在并发环境中成立。  

Deniable Ring Authentication Based on Multi-receiver Encryption

Deniable ring authentication protocol allows a sender to deny an authentication and his identity is anonymous to the receiver. In this work, we propose a new deniable ring authentication protocol based on the multi-receiver encryption scheme. The receiver encrypts an authentication key with multi-receiver encryption scheme and sends it to the sender. The sender decrypts it using his private key to obtain the authentication key and uses this key to authenticate messages. This protocol only requires two communication rounds and its deniability holds in the concurrent setting without requiring timing assumption due to the multi-receiver encryption.