A Secure Dynamic Conference Scheme with Anonymity for Mobile Communications

Abstract

To allow many users to hold a secure video teleconference in mobile communications, a conference key distribution scheme with dynamic participations is necessary. In the proposed dynamic conference key distribution schemes, the conference keys do not satisfy the forward or backward secrecy. So these proposed schemes are vulnerable by active colluding attacks. To remove this disadvantage, our new dynamic conference distribution scheme with forward and backward secrecy among different validity periods is proposed. Due to the consideration of limited computing ability and electronic power, the conference key renewal is performed periodically. Moreover, our scheme also satisfies anonymity to protect the conferees’ privacy.