шифрування

An image as a stochastic signal is one of the most common forms of information. Protecting images from unauthorized access and applying is a correspondingly urgent task. This causes the use of well-known classical encryption methods in the case of image encryption. But the image is a signal that possesses, in addition to typical informativeness, also visual informativeness. Informativeness for modern image processing methods makes it possible to ensure unauthorized access.

The improvement of homophonic encryption using the well-known Z408 cipher as an example has been examined in this article. Their problems to further correct the main shortcomings of this type of encryption have been analyzed. In the practical part, an encryption system similar to Z408 has been created and the complexity of the language analysis for this cipher has been increased. The correlation data of the number of alternative characters has been used to improve the transmission of encrypted data depending on the load of the device.

The images are one of the most used kinds of the information in modern information company. Therefore actual problems is the organization of protection from unauthorized access and usage. An important characteristic of the image is the presence of contours in the image. The task of contour selection requires the use of operations on adjacent elements that are sensitive to change and suppress areas of constant levels of brightness, that is, contours are those areas where changes occur, becoming light, while other parts of the image remain dark.

Regarding image encryption, a crucial task is to implement the application of such an RSA algorithm which will provide an opportunity:

– not to decay the cryptographic stability of the RSA algorithm;

– to ensure complete noisiness of an image to prevent the application of methods of visual image processing.

Consideration is given to enhancing storage security and maintaining data access control in cloud storage. Existing ways of controlling such access are analyzed. An enhancement of the encryption technique is proposed, based on the attributes of the ciphertext policy and its application in a decentralized data access management system in multi-user cloud storage systems. The main objective is to improve the security and privacy of the management of the cloud storage for which the existing management does not meet all the necessary requirements.

Images used as a stochastic signal are among the most commonly used types of information. Accordingly, the actual task is to protect such images from unauthorized access and use. This leads to the use of known classic encryption methods in the case of image encryption. Offered algorithms of encryption-decryption are intended for the use of images in grayscale and are based on using the ideas of basic RSA algorithm. Encryption – decryption can be carried out with extra noising and without too.

Described combination of elements of the RSA algorithm and a bit-wise operations for the joint use for encryption - interpretation of images. Encryption - decryption is performed without additional noise.

Described combination of elements of the RSA algorithm and a bit-wise operations for
the joint use for encryption – interpretation of images. Encryption - decryption is performed
without additional noise.

У роботі розглядаються методи захисту системи контролю розкриття апаратури (СКРА) від несанкціонованих і випадкових впливів. Вона побудована на основі технології сенсорних мереж стандарту IEEE 802.15.4. Дана технологія містить у собі деякі засоби захисту, проте їх недостатньо для сталого функціонування СКРА. На основі проведеного аналізу загроз, в роботі описується система захисту, яка включає вбудовані і додаткові засоби захисту. В сукупності вони утворює замкнутий контур навколо СКРА