Provably secure certificate-based key-insulated signature scheme

摘要

Certificate-based signature computation is often performed on insecure devices where the signature keyrnis easy to be exposed. To reduce the influence of key exposure, we introduce key-insulated mechanismrninto certificate-based cryptography and formalize the notion and security model of the certificate-basedrnkey-insulated signature scheme. We then present a certificate-based key-insulated signature scheme, whichrnis proven to be existentially unforgeable against adaptive chosen message attacks in the random oraclernmodel. The proposed scheme has potential applications in trusted computing.