Cloud layer
Messages sent in regular Telegram chats are encrypted between your device and Telegram's data centres using the MTProto protocol. Only your active sessions can decrypt the content.
Security & privacy
A practical guide to Telegram security
This page explains how Telegram actually protects your data, which knobs you should turn on the first day, and how to react when your SIM changes, you lose a device or you spot a suspicious login attempt.
Three layers
How Telegram encryption is really structured
Telegram uses different encryption layers depending on the type of conversation. Understanding the three layers below makes it easy to decide when to use Secret Chats and when regular cloud chats are enough.
Secret Chat layer
Secret Chats bypass the cloud entirely and use client-to-client encryption. Nothing is stored on Telegram servers, nothing forwards, screenshots trigger a warning, and messages can auto-destruct.
Account safety layer
Two-step verification, biometric locks, active session controls and recovery emails work together to keep an intruder out even if your SIM card gets swapped.
MTProto in plain English
A modern protocol built for speed and mobile networks
MTProto 2.0 encrypts your traffic between the Telegram app and Telegram's data centres. It uses AES-256, RSA-2048 and Diffie–Hellman key exchange, and is engineered to keep working on flaky 3G/4G connections and captive Wi-Fi networks.
- • Perfect Forward Secrecy inside every Secret Chat
- • Session keys rotate automatically to limit exposure
- • Voice and video calls are E2E encrypted with SRTP
- • Local storage can be additionally passcode-encrypted
Security checklist
Turn these on within the first five minutes
Six settings that stop 90% of realistic account-takeover attempts. Enable them once and Telegram becomes noticeably harder to attack.
- 1
Enable two-step verification
Settings → Privacy and Security → Two-Step Verification. Set a memorable password (not the SMS code!) and add a recovery email so no one can lock you out.
- 2
Turn on passcode + biometrics
Lock the Telegram app itself with a passcode plus Face ID, Touch ID or fingerprint. If your phone is lost, nobody can read your messages by simply unlocking the device.
- 3
Review Active Sessions monthly
Under Settings → Devices, sign out from any browser or laptop you no longer recognise. You can end every desktop session with one tap.
- 4
Use Secret Chats for the highest stakes
Secret Chats are end-to-end encrypted, stored only on the two devices involved and can auto-destruct. Start one from any private chat when it matters.
- 5
Limit who sees your phone number
Under Privacy and Security, switch phone number visibility to Nobody or My Contacts. Add exceptions if you still want select colleagues to reach you by number.
- 6
Set self-destruct timers on media
Photos and videos can auto-erase after being viewed, either globally in Secret Chats or per-media in regular chats. Great for one-off shots you don't want stored forever.
Recovery drills
What to do when something goes wrong
Even the best setup can face a lost phone, a stolen SIM or a suspicious login. Telegram gives you tools to react in seconds.
- Phone lost or stolen: from another device, go to Settings → Devices and end that phone's session. Change your two-step password immediately.
- SIM swapped: because two-step verification requires a password beyond the SMS code, an attacker with your number alone still cannot enter your account.
- Suspicious message: official Telegram notices arrive from the verified @telegram account. Anything else asking for a code is a phishing attempt — never share confirmation codes.
- Need a clean start: Settings → Privacy and Security → Delete My Account offers an auto-delete timer for inactive accounts, from 1 month up to 12 months.
Ready to secure your account?