CONSTRUCTION OF TWO-DIGIT TWO-OPERAND OPERATIONS OF STRICT AND STABLE CRYPTOGRAPHIC CODING

Abstract

The purpose of the work is to develop models of two-bit two-operand operations of strictly stable cryptographic transformation suitable for practical application in current and block ciphers. Results. The main criterion for strictly stable encryption is to achieve maximum uncertainty of encryption results at minimal cost. However, single-operand operations, despite the fact that they meet the criterion of strictly stable coding, do not have wide application in cryptographic algorithms. This is due to the fact that they are single-operand. For practical application of these results, it is advisable to adapt them to the processing of two operands. The authors constructed a cryptographic add-on operation model that provides a two-part two-operand-day two-operand strictly stable cryptographic encoding. The resulting operation provides the implementation of strict, stable cryptographic encoding when used in stream ciphers. The main advantage of the synthesized operation over the model of strictly stable cryptographic coding is the simplicity of its implementation, both at the hardware and software level. By using other combinations of single-operand operations of a strictly stable cryptographic transformation, other similar two-operand operations can be obtained. Conclusions. On the basis of research and a combination of one-operand operations of strict and stable cryptographic coding, a two-digit two-operand operation of a strict, stable cryptographic transformation, suitable for practical application in stream and block cipher both on the hardware and software level, is synthesized. The proposed approach allows expanding, due to the synthesis of new models of operations of strict and stable transformation, instrumental means of constructing new generation crypto primitives.