Analysis of the Bigrams of the Letters of the Uzbek Alphabet for Cryptanalysis

The development and development of means and methods of cryptography is directly accompanied by the development of cryptanalysis methods. The classical and one of the first methods of cryptanalysis is the frequency method. Historically, the first traces of frequency analysis of the text can be found in the works of scientists since the 10th century. And here the scientists of the East, such scientists as al-Kindi, made a great contribution to cryptanalysis. This paper presents an analysis of the frequencies of bigram of letters of the text in the Uzbek language. It should be noted that at the moment the Uzbek language is based on two alphabets, namely the Latin alphabet and the alphabet based on the Cyrillic alphabet. And now further changes in the alphabet of the Uzbek language are being considered. Determining the frequencies of bigram of the letters of the Latin alphabet of the Uzbek language is accompanied by difficulties associated with the fact that some letters are combinations of letters from the original alphabet and a symbol that is not in the alphabet, for example, the letter ‘ch’. Here the letter ‘h’ belongs to the given alphabet, but the letter ‘c’ does not. And this, in turn, leads to problems in the definitions of bigrams. Based on this, texts in the Uzbek language are analyzed here using the Cyrillic alphabet, where each letter corresponds to one character. Literary work is used as content. Based on this, in this article we present the results of determining the frequencies of bigram of letters of the Uzbek language based on the Cyrillic alphabet.