对一种基于椭圆曲线加密体制的安全性分析

Security Analysis of an Elliptic-Curve Based Encryption Scheme

本文对一种椭圆曲线环上的陷门离散对数加密体制的安全性进行分析,指出它存在的安全缺陷,攻击者通过选择适当的明文加密,在得到相应的解密明文后,能够分解模数,从而成功地攻击此加密体制,因此该体制不能抵抗选择密文攻击。

We provide security analysis of a trapdoor discrete logarithm encryption scheme in elliptic curve ring proposed by Paillier, and point out the security flaws of it. The attacker can choose a proper plalntext to be encrypted, after getting the decrypted plaintext, he can factorize the modulus, and attack the encryptlon scheme successively, so this encryption scheme can not withstand chosen ciphertext attack.