Many of the current image encryption algorithms are based on bit level

whichhave security flaws.Many bit-based image encryption algorithms divide the plain-text image into eight-bit planesaccording the eight binary pixels

and then scramble the eight bit planes

which results in 0 bits and 1 bits of each bit plane to not change

onlymakingthe position change of the 0bit and 1bit in each into bit plane

so that there are security flaws.In this paper

a new image encryption algorithm was proposed according to the existing problems of security flaws in these popular encryption algorithms.The proposed algorithm can resist the chosen-plaintext and the chosen-ciphertext attacks

and solve the position restriction of 0bit and 1bit in the bit plane to bring about global reconstruction. The scrambling of the image encryption algorithm is divided into two stages:the first stage of the scrambling is to be transformed into a binary pixel matrix for global scrambling;the second stage of the scrambling is to block the pixel matrix after the global scrambling and scramblefor each bit plane.First

the Tent chaotic map is used to generate a pseudo-random sequence.Then

each pixel of the plain-text image is converted into binary bits

andpseudo-random numbers are sorted in ascending order to generate a new set of sequences.For example

in any sequence {0.3

0.7

0.5

0.4

0.8

0.2}

the sequence is sorted in ascending order to obtain the ordered sequence {0.2

0.3

0.4

0.5

0.7

0.8}

and then the corresponding position sequence is {6

1

4

3

2

5}.The new sequence is used to carry out the whole row and column scrambling.The pixel matrix is divided into eight blocks to perform the Henon map scrambling

and then the final cipher image is obtained by the diffusion operation. The distribution of the pixel value of the plain-text image after encryption changes from non-uniform to uniform distribution

and the correlation between the pixels of the plain-text image is broken.Thus

the original image has no statistical characteristics

the number of pixels change rate(NPCR) and the unified average changing intensity(UACI) is close to the ideal values

and the algorithm can resist the differential attack.Experimental results show that when the algorithm key changes little

more than 99% of the pixels in the resulting cipher images are changed.This algorithm belongs to the symmetric encryption algorithm

anddecryption algorithm is also used in the same key so thatthe decryption key also has the same conclusion.Thus

the encryption algorithm is sensitive to the key.The key space of the algorithm must be large enough to resist the exhaustive attack.The key of the encryption algorithm is composed of two parts

which are the keys used to generate the chaotic sequence and the parameters needed in the diffusion phase.The key space of the algorithm is 2

which can resist the exhaustive attack.The algorithm can guarantee the security of encryption and have lower computational complexity.The cipher image obtained by the encryption algorithm of the plain-text image can be obtained by the information entropy formula.The information entropy of the cipher image is 7.996 2

which is very close to the ideal value of 8.Experimental results show that the encryption algorithm can avoid the information leakage duringimage encryption

and the image encryption algorithm has good anti-entropy analysis attack.The algorithm of image encryption proposed in this paper mainly includes two steps:scrambling and diffusion.The complexity of the algorithm is mainly reflected in the scrambling process.The running time of this algorithm is shorter than that of other image encryption algorithms

and the diffusion process is added to the algorithm.Therefore

the algorithm is more secure than other image encryption algorithms and is more resistant to differential attacks. The proposed algorithm is also a relatively classic "scrambling-diffusion" structure.Compared with other encryption algorithms with the same structure

this algorithm is based on bits to scramble.When 1bit in a certain pixel and 1bit of another pixel change in position

the changes not only include the position of the pixel but also the value of the pixel.Experimental results show that the proposed image encryption scheme has numerous characteristics

including large key space

low correlation of adjacent cipher pixels

and high sensitivity to the plain-text and key

which can effectivelyprotect the security of the encrypted image.In this algorithm

the global bits of the plain-text are first scrambled to avoid the scrambling of the bits in the same bit plane

which results in the weight of the 0bit and 1bit tonot change.The scrambling sequence used in the scrambling process is related to the plain-text image

so it shows partial diffusion effect.The experimental results also show that the algorithm is safe and practical and has good application prospects in image encryption and other applications.In the future work

we will continue to explore the new image encryption algorithm

and now compared with the popular encryption algorithm to improve the efficiency of the encryption algorithm while ensuring the security and practicality of the algorithm.