Attribute-Based Threshold Key-Insulated Signature

Key insulation is an important technique to protect private keys. To deal with the signing key exposure problem in attribute-based signature systems, we propose an attribute-based threshold key-insulated signature (ABTKIS) scheme. It strengthens the security and flexibility of existing attribute-based key-insulated signature schemes. Our scheme is provably secure in the standard model (i.e. without random oracles).