Universal Digital Image Encryption Algorithm Base on Chaotic Sequence

In order to protect digital image's information,a universal digital image encryption algorithm based on chaotic sequence is proposed.Firstly,according to the key and the size of image,a chaotic sequence is generated.Then,according to the sub-key and the type of image,the chaotic sequence is converted to an unsigned integer sequence.Lastly,pixel permutation encryption will be realized by using the XOR operation between the unsigned integer sequence and each corresponding pixel value in turn.The effect of encryption and security is also analyzed by using the evaluation index.Theoretical analysis and experimental results show that the algorithm has a large space of key,a good encryption effect,security and statistical characteristics,a strong anti-noise ability.