利用了混沌系统的伪随机性和遍历性,提出了一种新的两个一维混沌映射的动态查找表的数字图像加密算法。该算法在加密过程中,一个混沌映射作为干扰源,克服了单个一维混沌系统周期短、精度低的缺点。同时引入了反馈,动态的改变查找表,克服了静态查询密文分布不均匀缺点。理论分析与实验结果表明,该算法的安全性明显增强,加密速度也有所提高且对已有的攻击方法有了更强的抵抗能力。 Utilizing the pseudo-randomness and ergodicity of chaotic system, a new digital image encryption algorithm of dynamic look-up table with two-dimensional chaotic map is proposed. In the encryption process, a chaotic map as an interference source overcomes the shortcoming of a single one-dimensional chaotic system with short period and low accuracy. At the same time, feedback is introduced to dynamically change the look-up table, which overcomes the shortcoming of uneven distribution of static query ciphertext. Theoretical analysis and experimental results show that the security of the algorithm is obviously enhanced, the encryption speed is also improved, and the existing attack methods are more resistant.