Κρυπτογραφία-ασφάλεια S-box συμμετρικών αρλγορίθμων
Βερύκιος, Θωμάς Ν.
The issue of distribution of information in such a way as to obtain the requisite security and at the same time to prevent possible attempts of tampering or altering its content is the subject of scientific study since the antiquity. Especially with the rapid development of communication technologies in the modern era, the need for safe systems of information management becomes even more imperative. Cryptography and various methodologies have been developed on this basis, proved an effective solution to specific security issues. This paper presents the fundamental terms of cryptography and the historical data. Here are the species which is distinguished and the main algorithms having been developed. As evidenced by various scientific studies that have been developed, an important component of encryption algorithm is the substitution box "S-box" for which it is shown the way of design and function and identified the key attributes to the required security. Finally, some of the most important studies are presented which certify the safety of S-boxes for symmetric algorithms and their resistance to attacks algebraic, differential or linear cryptanalysis.