With the rapid development and popularization of computer networks and information storage technologies

networks have become a mainstream tool for information transmission. This medium is used to transmit information

including text messages

audio

images

and other multimedia files. Thus

networks intuitively play an irreplaceable media-related role in the transmission of information flow security as the main carrier of network information. The security problem in the network transmission of image data must be solved effectively; therefore

an encryption algorithm of image blocking and double adaptive diffusion using Arnold maps (BDAM) was proposed in this paper to address image security issues. This algorithm can improve the efficiency and security of image encryption.BDAM first uses Logistic

Tent

and Sine maps to build three types of novel 1D chaotic maps according to the scheme of pairwise combination. This algorithm then extracts the initial chaotic sequence. Then

BDAM defines an initial encryption image matrix that is similar in size to the plain image matrix. The latter is divided into small blocks. The initial encryption image matrix pretreats the parameters of the Arnold map. The pixels in the random position of the plain image matrix are deposited at random positions within the random block of the initial encryption image matrix when ordinary and reverse maps are joined. At the same time

adaptive diffusion occurs among intra-block pixels and inter-blocks until the initial encryption matrix is filled. Scrambling and diffusion synchronization are initiated by combining forward and reverse Arnold mapping processes. The BDAM algorithm can equalize the access sequence of each pixel and the position of each storage sequence

enhance scrambling randomness

and overcome the drawbacks of conventional Arnold mapping from rules to the defects of random access. In addition

this algorithm can apply block and double adaptive diffusion in the scrambling process. The interactions among the ciphertext pixels and ciphertext pixels

plaintext pixels

and chaos random sequence spread the influence of each pixel to the image matrix of the entire site nonlinearly. Furthermore

these interactions continuously disturb chaotic systems during diffusion

initiate adaptive diffusion

and enhance the sensitivity of the encryption key

the ciphertext

and plaintext. The results of simulation and of performance comparison analysis show that the BDAM algorithm is superior to other encryption algorithms for many types of gray images in terms of information entropy

key space

correlation

and sensitivity

among other aspects. Scrambling randomness is favorable as well. Moreover

the algorithm displayed high sensitivity to the key and to the plaintext

thus improving encryption results. Random scrambling that is combined with blocking and double nonlinear adaptive diffusion through the BDAM algorithm can resist various attacks effectively and exhibit high security. Therefore

this method is suitable for all types of gray-scale images and may be applied in this field.