MS excel-based application for encryption and decryption of English texts with the hill cipher on the basis of 3×3-matrix

The paper describes MS EXCEL-based application implementing the processes of encryption and decryption of English texts using the Hill cipher based on the matrix of size 3×3. The processes of encryption and decryption of 6-character words in English are illustrated. Numerous examples obtained by the application developed are presented in the paper. The material is used in the educational process in the course “Telecommunication Security” but it can be applied in other disciplines involving issues of cryptographic information protection.