The issue of protecting transmitted data on the network is urgent during the ubiquitous penetration of the Internet into all spheres of human life. Many attackers can use confidential information for their own purposes for committing offenses. Modern messengers and services use encryption of messages and data that only the addressee can read.
A bit of history
The first hints of encryption appeared in antiquity. Secret records began to be used to conceal texts, decrees, correspondence, and recipes. Of course, then the encryption technology was much simpler - the letters of the alphabet changed to numbers, other characters, or skipped altogether. The addressee knew the designations of all the characters and could read the message.
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Some of them encrypt their channels, some do not. The Telegram messenger, which promises the highest possible safety and security, and which has already gained little scandals and intrigues, is gaining wide popularity. At the same time, it uses a special end-to-end encryption mode based on the MTProto protocol. How effective is it - time will tell.