Identity-Based Strong Key-Insulated Ring Signature Scheme in the Standard Model

In order to improve the security of ring signature, we combine standard ring signature and key-insulated cryptography. We give the definition and security model for ID-based key-insulated ring signature, and at the same time we proposed an ID-based strong key-insulated ring signature scheme. This scheme can deal with key-exposure problem. The proposed ring signature scheme enjoys several attractive features: (1) it is provably secure in standard model, (2) it is unconditional anonymous, (3) it is strong key-insulated, (4) it allows frequent key-updates without increasing the risk of helper key-exposure, and thus enhances the security of the system.