---
title: "What Is Telegram MTProto 2.0 and How Does It Ensure Protocol Security?"  
description: "What Is Telegram MTProto 2.0 and How Does It Ensure Protocol Security?"  
author: "Pedro Araez"  
published: 2026-08-31  
updated: 2026-08-31  
canonical: https://answers.mindstick.com/qa/117125/what-is-telegram-mtproto-2-0-and-how-does-it-ensure-protocol-security  
category: "Cryptography"  
tags: ["Cryptography", "telegram", "MTProto", "Network Security"]  
reading_time: 1 minute  

---

# What Is Telegram MTProto 2.0 and How Does It Ensure Protocol Security?

Telegram relies on its proprietary custom cryptographic protocol named **MTProto**. The protocol's second iteration, **MTProto 2.0**, addresses earlier cryptographic criticisms and improves integrity checks.

## Cryptographic Primitives Used in MTProto 2.0

MTProto 2.0 combines strong, standard primitives to safeguard communication:

- **256-bit AES Encryption:** Used in Infinite Garble Extension (IGE) mode to encrypt payload data.
- **SHA-256 Hashing:** Replaced SHA-1 for Message Authentication Code (MAC) generation to prevent collision attacks.
- **2048-bit RSA Encryption:** Utilized during the key exchange phase to authenticate servers.

## Improvements over MTProto 1.0

MTProto 2.0 mitigated chosen-ciphertext attacks by including random padding bytes inside the encrypted message envelope before calculating the SHA-256 hash digest, providing stronger cryptographic bounds.


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Original Source: https://answers.mindstick.com/qa/117125/what-is-telegram-mtproto-2-0-and-how-does-it-ensure-protocol-security

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