Technical

Telegram Secret Chats vs Cloud Chats: Where the Proxy Helps

Understanding Telegram's two encryption models and how MTProto proxies interact with each.

MTProto Proxy Engineers · Censorship Circumvention Researchers

Published April 27, 2026 Updated May 15, 2026 8 min read 401 words

Two types of Telegram chat

Telegram has two distinct chat models. Cloud Chats are the default — encrypted in transit between you and Telegram's servers, stored on Telegram's servers, syncable across devices. Secret Chats use end-to-end encryption between two specific devices, are not stored on Telegram's servers, do not sync between devices, and support self-destructing messages. Both work with TGFast proxies, but the privacy properties differ.

How a proxy interacts with Cloud Chats

For Cloud Chats, the proxy adds an extra layer of obfuscation between your device and Telegram's servers. Your messages are encrypted twice: once with MTProto session keys (between you and Telegram), and once with the proxy's obfuscation envelope (between you and TGFast). Telegram's servers can read your messages (this is by design — they need to deliver them to your other devices and contacts). The proxy cannot read them.

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How a proxy interacts with Secret Chats

For Secret Chats, the proxy adds the obfuscation envelope as before, but the inner content is end-to-end encrypted between you and your contact. Neither Telegram's servers nor the proxy can read the message content. The proxy still routes the encrypted bytes — you just cannot interpret them along the way.

Why Secret Chats matter for high-risk users

If your threat model includes "Telegram's servers might be compromised or compelled by a government", Secret Chats are the only safe choice. They provide the same end-to-end guarantee as Signal or WhatsApp. The downside: you can only access them from one device at a time.

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Proxy + Secret Chat = best privacy

For maximum privacy, combine: (1) Telegram registered with a non-attributable phone number (eSIM from a different country); (2) TGFast proxy enabled to hide connection metadata from your local ISP; (3) Secret Chats for sensitive conversations. This gives you four layers of protection: your local network sees only TGFast traffic; TGFast sees only encrypted MTProto bytes; Telegram sees only end-to-end encrypted Secret Chat blobs; only your contact can decrypt the messages.

Self-destructing messages

Secret Chats support timer-based message auto-deletion (1 second to 1 week). This is useful for ephemeral coordination but does not retroactively delete screenshots — assume the recipient may have captured anything you send.

When Cloud Chats are fine

For everyday non-sensitive communication, Cloud Chats are perfectly safe and much more convenient (multi-device sync, full search, large file uploads). The proxy provides good metadata privacy. Reserve Secret Chats for genuinely sensitive content.

Frequently Asked Questions

How is MTProto different from SOCKS5 or Shadowsocks?

MTProto is Telegram's native protocol, so traffic looks indistinguishable from a normal Telegram connection to deep packet inspection. SOCKS5 is a generic proxy with a recognizable handshake; Shadowsocks adds obfuscation but still requires the operator to defend their port and keys against probing. MTProto with Fake-TLS adds a TLS-1.3-mimicking handshake that has proven the hardest of the three to fingerprint.

Why does the secret start with "dd" or "ee"?

The leading byte is a magic prefix that tells the Telegram client which obfuscation mode to negotiate. "dd" enables MTProto 2.0 random padding to defeat traffic analysis; "ee" indicates Fake-TLS mode where the entire session is wrapped in a TLS 1.3 handshake. Both are interoperable with all modern Telegram clients.

Can a network operator detect that I am using an MTProto proxy?

A determined operator can sometimes flag suspicious flows by timing analysis, but the encrypted payload itself is opaque. Fake-TLS makes detection significantly harder because the handshake mimics a real HTTPS site (including SNI, ALPN and certificate exchange). Even when flagged, blocking is per-IP, not per-protocol — which is why TGFast rotates IPs continuously.

Does an MTProto proxy add real cryptography or only obfuscation?

Both. The MTProto 2.0 transport adds AES-256-IGE encryption between client and server with per-session keys derived from the shared secret, and Fake-TLS wraps that channel inside a real TLS 1.3 handshake. Even if the proxy operator were malicious, they could not decrypt the inner Telegram session — that key is negotiated end-to-end with Telegram's data centres.

How does TGFast pick which servers to deploy and where?

We monitor latency and packet loss from probe nodes in 14 cities across the regions hit hardest by Telegram restrictions. New servers are spun up where the median latency to nearby ISPs falls below 80 ms and where the upstream provider has historically resisted ISP take-down requests. Capacity is rebalanced weekly.