Client-Server Encryption for Cloud Chats
Posted: Thu May 29, 2025 6:46 am
The app encrypts the message before it leaves the sender's device and only decrypts it after it arrives on the recipient's device. Telegram's servers only see encrypted gibberish.
Crucially, the app ensures that Secret Chats are device-specific and do not sync to the cloud or other devices. If you start a secret chat on your phone, it lives only on that phone and the recipient's device.
Features like self-destructing messages, screenshot alerts, and no-forwarding are all managed by the app for Secret Chats.
For all other chats (default private chats, groups, channels), the app encrypts messages before sending them to Telegram's servers.
The server then decrypts the messages (to process them, e.g., for channel synchronization or message search indexing) and re-encrypts them before sending them to the recipient's app.
This means Telegram's servers technically have the ability to access these messages, though they telegram data claim strong security measures and distributed key management to prevent unauthorized access.
3. Synchronization
The Telegram app handles the real-time synchronization of Cloud Chats across all devices where the user is logged in. This means a message sent from your desktop app immediately appears on your mobile app, and vice-versa, because they all pull from the same cloud record.
Secret Chats, however, explicitly do not sync. This is a privacy feature, ensuring that only the original communicating devices hold the chat history.
Privacy Settings Within the Telegram Apps (User Controls)
A key aspect of the "Telegram data app" is the extensive set of privacy controls available directly within the app's "Privacy and Security" settings. These empower users to manage their data visibility and interactions:
Phone Number: Control who can see your phone number (Everybody, My Contacts, Nobody) and who can find you by your number.
Last Seen & Online: Manage visibility of your online status and last seen timestamp.
Crucially, the app ensures that Secret Chats are device-specific and do not sync to the cloud or other devices. If you start a secret chat on your phone, it lives only on that phone and the recipient's device.
Features like self-destructing messages, screenshot alerts, and no-forwarding are all managed by the app for Secret Chats.
For all other chats (default private chats, groups, channels), the app encrypts messages before sending them to Telegram's servers.
The server then decrypts the messages (to process them, e.g., for channel synchronization or message search indexing) and re-encrypts them before sending them to the recipient's app.
This means Telegram's servers technically have the ability to access these messages, though they telegram data claim strong security measures and distributed key management to prevent unauthorized access.
3. Synchronization
The Telegram app handles the real-time synchronization of Cloud Chats across all devices where the user is logged in. This means a message sent from your desktop app immediately appears on your mobile app, and vice-versa, because they all pull from the same cloud record.
Secret Chats, however, explicitly do not sync. This is a privacy feature, ensuring that only the original communicating devices hold the chat history.
Privacy Settings Within the Telegram Apps (User Controls)
A key aspect of the "Telegram data app" is the extensive set of privacy controls available directly within the app's "Privacy and Security" settings. These empower users to manage their data visibility and interactions:
Phone Number: Control who can see your phone number (Everybody, My Contacts, Nobody) and who can find you by your number.
Last Seen & Online: Manage visibility of your online status and last seen timestamp.