Anonymous Group Implicit Certificate Scheme

We propose an anonymous identity-based public key group implicit certificate scheme to preserve the anonymity of mobile users in a communication network. The use of a standard public key certificate in a wireless communication network will allow unauthorized entities, who are listening to the communication channel, to identify and trace movements and locations of a mobile user using the user´s unique public key in the certificate. The disclosure of such information may raise privacy concerns. In our proposed anonymous identity-based public key group implicit certificate scheme, recipients of a broadcasted message can authenticate the transmitter and validate the integrity of the message without identifying the transmitter. In case of a dispute and malicious activities, the identity of the mobile user who broadcasted the disputed message can be revealed only by a trusted authority.