A Short Certificate-based Signature Scheme with Provable Security

An efficient short certificate-based signature scheme

Certificate-based cryptography combines the merits of traditional public key infrastructure (PKI) and identity-based cryptography. It does not have the key escrow problem in identity-based cryptography, and eliminates the certificate revocation problem and third-party queries in traditional PKI. In this paper, we first refine the security model of certificate-based signatures introduced in Euro...

A Certificate-Based Signature Scheme

In this paper, we propose the security notion of certificate-based signature that uses the same parameters and certificate revocation strategy as the encryption scheme presented at Eurocrypt 2003 by Gentry. Certificate-based signature preserves advantages of certificatebased encryption, such as implicit certification and no private key escrow. We present concrete certificate-based signature sch...

A Certificateless Proxy Ring Signature Scheme with Provable Security

Proxy ring signature allows proxy signer to sign messages on behalf of the original signer while providing anonymity. Certificateless public key cryptography was first introduced by Al-Riyami and Paterson in Asiacrypt 2003. In certificateless cryptography, it does not require the use of certificates to guarantee the authenticity of users’ public keys. Meanwhile, certificateless cryptography doe...

New (t, n) threshold directed signature scheme with provable security

Directed signature scheme allows only a designated verifier to check the validity of the signature issued to him; and at the time of trouble or if necessary, any third party can verify the signature with the help of the signer or the designated verifier as well. Due to its merits, directed signature scheme is widely used in situations where the receiver’s privacy should be protected. Threshold ...

A Forward-Secure Certificate-Based Signature Scheme