The article is devoted to an overview of the multi-platform messenger Telegram, a study of its use and an overview of the reasons for its great popularity in Ukraine, and the provision of detailed methodological recommendations for ensuring the security of users' personal data in accordance with the latest cybersecurity practices. This article highlights the main problems of the popular messenger, starting with certain clauses of the privacy policy of this application; using examples, it shows how users' confidential information is collected in the modern digital environment through various chatbots and information channels; shows the dangerous impact of such channels on the formation of political opinion of Ukrainian society; reviews Telegram's own encryption algorithm MTProto for regular chats and secret chats with end-to-end encryption and identifies the problems associated with the use of the application. The article focuses on the importance of protecting confidential data of Telegram account holders. The storage and processing of this type of data requires a high level of security, since their unauthorized leakage or breach of integrity can lead to the theft of other types of
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