Image encryption method based on Montgomery-RSA algorithm

Abstract

The invention discloses an image encryption method based on a Montgomery-RSA algorithm. The method comprises the following steps: S1, inputting an image; s2, extracting RGB pixels from the images, andcreating an independent matrix for each image; s3, dividing each image into a plurality of image blocks, generating a mapping table, and recording the size and the position of each block; s4, performing encryption and decryption operations on each image block and the mapping table by using a Montgomery-RSA algorithm; and s5, outputting an image. According to the method, the image is encrypted according to the RGB color band blocks, so that the transmission of the confidential image has higher confidentiality; meanwhile, the image data transmission speed can be effectively improved through theMontgomery improved RSA algorithm.

Description

Technical field [0001] The invention relates to the technical field of information security, in particular to an image encryption method based on Montgomery-RSA algorithm. Background technique [0002] At present, under the increasingly open network environment, people mainly use the Internet to transmit digital images. While the Internet brings convenience to people, it also brings information security issues. This makes it necessary to transmit digital images on unreliable communication channels. Has high security. [0003] The long history of cryptography encryption technology is widely used in data security protection. The purpose of image encryption is to hide the true information of the image, so that the image stealer cannot obtain the original image, and the recipient can easily obtain the encrypted information through a predetermined decryption method. Information encryption technology can provide secure communication in the presence of malicious opponents, thereby ensur...

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Problems solved by technology

[0004] Encryption algorithm is the core of cryptographic technology, mainly divided into symmetric encryption algorithm and asymmetric encryption algorithm: the biggest feature of symmetric encryption algorithm is that encryption and decryption use the same secret key, commonly used algorithms such as AES and DES; the calculation amount of symmetric encryption algorithm Small size, fast encryption speed, but both the sender and receiver must keep the secret key well. Too many secret keys will bring a certain burden to the management of the secret key, which is not safe enough; the most common asymmetric encryption algorithm is the RSA algorithm, and the asymmetry is the main It shows that different secret keys are used in encryption and decryption, which are divided into public key and private key. The public key is used to encrypt data, and the private key is used to unlock encrypted data. The speed of encryption and decryption is slow, and it is only suitable for encrypting a small amount of data. Decryption, although the security is higher than the symmetric encryption algorithm, there is still room for improvement

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