Certificate-Based Key-Insulated Signature in the Standard Model: TABLE 1.
Jiguo Li, Haiting Du, Yichen Zhang · The Computer Journal · 2016
The key-insulated signature scheme provides a good method to solve key exposure problem. The key-insulated mechanism has been extended to the identity-based cryptography (IBC) and certificateless cryptography. As a new cryptographic primitive, certificate-based cryptography has unique advantage without key escrow problem in IBC and the complex certificate management problem in traditional PKI. However, certificate-based signature operations are usually performed on insecure environments where the signature key exposure is inevitable. In order to solve this problem, we intro- duce key-insulated idea into certificate-based cryptography and propose the notion and security model of the certificate-based key-insulated signature (CBKIS). In addition, we present a CBKIS scheme that is provably secure in the standard model. Security of scheme is reduced to the hardness of Non Pairing-based Generalized Bilinear DH problem and Many Diffie–Hellman problem. The proposed scheme solves the key exposure problem and improves the security in certificate-based cryptography.