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BelT Block Cipher

Sergey Agievich, Victor Galinskij, Nikolai Mikulich, Yuriy Kharin · 2026 · arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.31178 · cited by 0 works (OpenAlex) · open-access PDF

Russian

BelT - это блок-шифровальщик с 128-битным размером блока и 256-битным ключом, разработанный в Беларуси и принятый в рамках белорусского национального стандарта STB 34.101.31 для шифрования и контроля целостности. Его спецификация была выпущена в качестве предварительного стандарта в 2007 году, став окончательным стандартом в 2011 году. BelT использует восьмиконечную структуру, объединяющую элементы сети Feistel и схемы Lai-Massey. Эта статья представляет полное описание шифрования и объясняет принципы, лежащие в основе его дизайна.

Machine translation (Meta M2M100); the English original follows.

Abstract

BelT is a block cipher with a 128-bit block size and a 256-bit key, developed in Belarus and adopted as part of the Belarusian national standard STB 34.101.31 for encryption and integrity control. Its specification was issued as a preliminary standard in 2007, becoming a final standard in 2011. BelT employs an eight-round structure combining elements of a Feistel network and the Lai-Massey scheme. This paper presents a complete description of the cipher and explains the principles underlying its design. Software performance and possible optimizations of BelT are discussed in comparison with those of candidates in the Advanced Encryption Standard (AES) competition.

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Topics: Block cipher, Computer science, CBC-MAC, Block cipher mode of operation, Triple DES, Transposition cipher

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