At present, most anonymous communication systems only provide anonymity to the sender. For example, groups (Crowds) use forwarding probability to hide the identity of the sender, while the receiver is completely public to the members of the Crowds. This paper combines the idea of the sender anonymous communication system Crowds and multicast technology to propose a new two-way anonymous communication protocol. This protocol forwards messages randomly among multiple group members to achieve sender anonymity. When the message is decided to be delivered, it is delivered to the receiver in a multicast manner, thereby achieving receiver anonymity. Keywords: two-way anonymity; group; public key encryption; multicast
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