Exposure of secret keys may be the most devastating attack on a public key cryptographic scheme since such that security is entirely lost. The key-insulated security provides a promising approach to deal with this threat since it can effectively mitigate the damage caused by the secret key exposure. To eliminate the cumbersome certificate management in traditional PKIsupported key-insulated sig...

Elliptic curve-based certificateless signature is slowly gaining attention due to its ability to retain the efficiency of identity-based signature to eliminate the need of certificate management while it does not suffer from inherent private key escrow problem. Generally, cryptosystem based on elliptic curve offers equivalent security strength at smaller key sizes compared to conventional crypt...

A note on ‘An efficient certificateless aggregate signature with constant pairing computations’ Debiao He , Miaomiao Tian, Jianhua Chen 1 School of Mathematics and Statistics, Wuhan University, Wuhan, China 2 School of Computer Science and Technology, University of Science and Technology of China, Hefei, China *Email: [email protected] Abstract: Recently, Xiong et al. [H. Xiong, Z. Gua...

In this paper, we construct a new identity-based signcryption scheme from bilinear pairings, which can process arbitrary length plaintexts. The scheme produces shorter ciphertext than the Libert-Quisquater signcryption scheme for the same plaintext and adapts to the bandwidth-constrained scenario very well. It is proved secure against adaptive chosen ciphertext and identity attack based on a va...

The idea of signcryption is to provide a method to encrypt and sign data together, so it is more efficient than using an encryption scheme combined with a signature scheme. We present an identitybased signcryption solution, which is one of the most efficient, provably-secure schemes proposed to date. Our scheme admits provable security in the random oracle model under the bilinear DiffieHellman...

In these years, the design of certificateless signature (CLS) scheme without bilinear pairings has been thoroughly investigated owing to its effectiveness on solving the key escrow problem in identity-based cryptography. In this paper, we identify that Wang et al.’s certificateless signature scheme cannot fulfil its security claims. We present a series of attack processes to demonstrate that Wa...

Signcryption is a cryptographic primitive that performs digital signature and public key encryption simultaneously, at lower computational costs and communication overhead than signing and encrypting separately. Recently, Chung et al. proposed an anonymous ECC-based signcryption scheme. We show that their scheme is not secure even against a chosen-plaintext attack.

This study presents an anonymous signcryption scheme based on the elliptic curve cryptosystem, which combines the properties of elliptic curve cryptosystem and ring signature. While the signers are endowed with anonymity through the technique of ring signature, the elliptic curve cryptosystem achieves the advantages of high security, low computation load, and small bandwidth requirements. To in...