A Group Signature Scheme with Multiple Strategies from Bilinear Pairings

A group signature scheme from Bilinear Paring equipped with Multiple Security Strategy is proposed. This scheme has forward security which minimizes the damage caused by the exposure of any group member´s signing key, and does not affect the past signatures generated by this member; meanwhile, ahead signature generated by a group member before the joining date can be prevented via this strategy. Moreover, this scheme support the group member revocable function efficiently and further has no requirement for time period limits.