International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Four of most of popular Bulgarian application were selected, namely “100 Places Bulgaria“, “I Love Bulgaria”, “Опознай.bg“ and ”The one hundred national tourist sites of Bulgaria”, and compare them. Data collection was performed through an electronic questionnaire, which was based on Google Forms. The article presents the need for a solid theoretical foundation for understanding the complexity and multi-layeredness of user experience (UX) and user interface (UI) in the context of digital transformation.

Nowadays advancing world of technology, mobile applications are rapidly growing segment of global mobile market. The proposed application aims to support self-learning of students, but also to facilitate the learning process, by offering a teaching panel where courses can be created and lectures can be added to them. The application was designed using the Android Studio programming environment and was written in the Java programming language. It is fully dynamic, as all information entered by the user being stored in a database.

Security of confidential information has always been an important issue. The aim of this work is to present and discuss the main themes at a new level in steganography methods nowadays. This review paper introduces a comprehensive survey related to nowadays embedding techniques. Steganography is often used with cryptography so that the information is doubly protected, but the combination of these techniques ensures that even if the steganographic method is discovered, the encrypted data remains secure and unreadable without the proper decryption key. This dual-layered approach significantly enhances the overall security of the hidden information.

The article deals with the steganography system which hides text inside images without losing data in components of RGB model The secret message is hidden in the cover image using Least Significant Bit (LSB) algorithm. The comparative results for the proposed algorithm are very promising for blue components of image. To evaluate steganography system properties are used the measures like Signalto- Noise Ratio (SNR), Peak Signal-to-Noise Ratio (PRSN), Mean Squared Error (MSE) and Structural Similarity Index for measuring (SSIM). The aim of the study is to determine whether there is a change in the qualitative characteristics of the stego image, when it is hidden the same information, but in a different color channel, to determine which color channel shows the most invisibility to others and is it advisable to be used in the transmission of confidential information.

This article presents the peculiarities of computer graphics introduction of innovative methods, and the susceptibility of students to the application to the teaching method. Teaching enjoys to high status, depending in part on the amount of study required to prepare for employment. The organizational complex is stable in some sides and changing in others.

The current report takes a look at possible problems with information security on mobile devices, analyzes them and suggests some of the possible solutions. We’re taking a look at problems with transfering information between mobile devices and how this information can be received without letting people outside the conversation get access to it