!!! Overview
[{$pagename}] is a [cloud]-based [Instant Messaging] and [Voice over IP] [Service Provider].[{$pagename}]'s [Client-side] [code] is [Open Source] software whereas its [server-side] code is closed-source and proprietary. [{$pagename}] service also provides [APIs] to independent developers. 

Telegram uses a [Symmetric Key Cryptography] scheme called [MTProto]. The [protocol] was developed by Nikolai Durov and other developers at [{$pagename}] and is based on [AES-256] [Symmetric Key] [encryption], [RSA] 2048-bit [encryption] and [Diffie-Hellman key-exchange].

[{$pagename}]'s [Messages] and [media] in Telegram are [encrypted] when stored on its [servers], and the [client-server] [communication] is also [encrypted]

[{$pagename}] service provides [End-to-end Encryption] for [voice] calls, and __optional__ [End-to-end Encryption] for __"secret" chats__ between two online users, yet not for groups or channels.

[{$pagename}] [Digital Identity] of [End-User]'s are bound by  to [Phone Numbers] and are verified by [SMS].

[{$pagename}] has some other projects:
* [Telegram Open Network] ([TON])
* [Telegram Passport]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Telegram_(software)|Wikipedia:Telegram_(software)|target='_blank'] - based on information obtained 2019-08-27 
* [#2] - [Introducing Telegram Passport|https://telegram.org/blog/passport|target='_blank'] - based on information obtained 2019-08-27 
* [#2] - [Telegram Login for Websites|https://telegram.org/blog/login|target='_blank'] - based on information obtained 2019-08-27