一种改进的最低有效位信息隐藏算法

An improved least significant bits hiding algorithm

针对空间域的最低有效位(LSB)算法鲁棒性低且抗攻击能力弱的特点,提出一种改进的算法。首先,用Arnold变换对秘密信息进行置乱预处理,使真实信息变成乱码;然后,在信息嵌入过程中,调整载体信息最低两个比特位,使它所表示那一个比特位与秘密信息的比特位相一致,避免了传统LSB算法直接在载体信息最低位上嵌入秘密信息;最后,用逻辑运算实现信息隐藏,故信息的提取只需要简单的运算。实验表明,改进后的算法有效增强其鲁棒性,能有效抵抗加噪、滤波和剪切等非法攻击。

Based on the least significant bits （LSB） algorithm for spatial domain with low robustness and weak resistance to attack, an algorithm for enhancing its robustness and resistance to illegal attacks is proposed. Firstly,the algorithm performs scrambling pretreatment using Arnold transform on secret information. True information becomes garbled. Then during the information embedding process, the lowest two bits of carrier information are adjusted so that the represented bit and secret information bits are the same. Embedding directly on the lowest level in traditional LSB algorithm is avoided. Because the information is hidden with the logic operation,the information extraction only needs the simple logic operation. Experiments show that the improved algorithm is effective for enhancing robustness and resistance to illegal attacks.