Abstract: Hyper-chaotic system image encryption algorithm HYPER_HIE uses elementary transformation and exjunction to encrypt, so it is difficult to resist various attacks. Aiming at three steps of HYPER_HIE including key generation, pixel scrambling, image diffusion and confusion, this paper chooses three kinds of plaintext matrixes to do chosen plaintext attack without knowing encryption key. An instance shows that the attack method can decode ciphertext with low computing costs.

Key words: hyper-chaotic system, image encryption algorithm, chosen plaintext attack, plaintext matrix, matrix transformation, cipher matrix

摘要： 超混沌系统图像加密算法HYPER_HIE由于采用初等变换和异或运算作为加密措施，因此很难抵抗各种攻击。针对该算法的3个步骤，即密钥生成、像素置乱、图像扩散与混乱，选择全零矩阵、行相同矩阵和列相同矩阵这3种明文矩阵，在未知加密密钥的前提下对该算法进行选择明文攻击。通过一个实例表明，该攻击方法仅以很小的计算代价破译了密文。

关键词: 超混沌系统, 图像加密算法, 选择明文攻击, 明文矩阵, 矩阵变换, 密文矩阵

CLC Number: 

• TP309.7