According to the official Telegram FAQ section, You can create secret chats that use end-to-end encryption. This means only you and your chat partner can read those messages. You can also able to set your chat to self-destruct in a certain period of time after it has been read or opened. If your device is stolen or someone took it, and you don’t want him/her to see the messages in your chat window, then you can simply terminate all the active sessions with just one click using your Mac, Desktop, Linux or Web client.
Everyone (default one: Allow everyone to view your profile. App Passcode Options Under the Other section, tap Open Links in and then choose a preferred browser from the list. Telegram Saved Messages
Another security feature that adds usability is usernames. Instead of giving people your phone number, you can simply give them your username. This gives you better control over what information is out there, and how people can contact you in the future. The encryption is based on 2048-bit RSA encryption, 256-bit symmetric AES encryption, and Diffie–Hellman secure key exchange. Pin Messages in Channels Bot API: lets you build programs that use Telegram messages for an interface. You don’t need to have knowledge of MTProto encryption protocol. The intermediary server will handle all communication and encryption with Telegram API for you.
Telegram comes with some customization options absent from many of its competitors where you can choose the dominant app color, how the app opens links, whether or not the UI shows animations, and more. There is also chatbot integration where you can make use of bots to improve the experience. You can even create your own themes, bots, and full apps using the Telegram API. Over the years, Telegram has built up an extensive bot ecosystem that adds even more functionality to the app. First and foremost, Telegram’s headline feature is privacy, and to ensure this it employs end-to-end encryption. This is what stops those outside a two-way conversation — be it a company, the government, hackers, or someone else — from seeing what has been sent.
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