Telegram’s Secret Chats: Are They Actually Secure?

What Are Telegram’s Secret Chats?

Secret Chats are Telegram’s opt-in encrypted messaging feature. Unlike standard Telegram chats—which are cloud-based and accessible from any device logged into your account—Secret Chats are device-specific and do not sync across multiple devices. They use end-to-end encryption (E2EE), which means that only the sender and recipient can read the messages. Not even Telegram itself, in theory, can access them. Telegram’s regular chats, on the other hand, are not end-to-end encrypted. They are encrypted during transit and stored encrypted on Telegram’s servers—but with keys that Telegram controls. This distinction is crucial: Secret Chats are designed for privacy, while regular chats prioritize functionality and convenience, such as syncing messages across devices or using bots.

How Does the Encryption Work?

Telegram uses its own custom encryption protocol called MTProto, which combines 256-bit symmetric AES encryption, 2048-bit RSA encryption, and Diffie-Hellman key exchange. While this may sound impressive, security experts have raised concerns about MTProto’s transparency and cryptographic design choices. Unlike the Signal Protocol—which is open-source, peer-reviewed, and widely adopted by other messaging platforms—MTProto has not undergone the same level of independent scrutiny or adoption. Critics argue that Telegram’s decision to invent its own cryptographic system, rather than using industry-standard, battle-tested options, increases the risk of vulnerabilities—especially since even small implementation errors can have disastrous consequences for user security. While Telegram claims MTProto is robust and secure, the lack of academic consensus makes some experts wary.

What Features Are Available in Secret Chats?

Telegram’s Secret Chats come with a few privacy-enhancing features. You can set messages to self-destruct after a chosen time period. Screenshots are disabled in many devices (though this can be bypassed with other tools), and messages cannot be forwarded. Secret Chats also don’t support message backups, cloud sync, or integration with Telegram’s bots and channels—design choices that reinforce their privacy-oriented nature. However, there are limitations. Secret Chats only work between two users—not in groups—and must be initiated manually. This means the vast majority of Telegram conversations, including large public channels and group chats, do not benefit from end-to-end encryption. Many users wrongly assume that all Telegram chats are protected the same way, leading to a false sense of security.

Telegram’s Security Model: Trust vs. Transparency

Unlike apps like Signal, Telegram’s overall privacy model is somewhat opaque. While Secret Chats offer end-to-end encryption, Telegram stores standard messages in the cloud, which it can technically access. It also collects metadata like IP addresses, device types, and timestamps. Telegram has stated that it has never shared user data with any government and has resisted demands for surveillance. But its closed-source server code and the lack of independent audits leave these claims difficult to verify. Furthermore, Telegram is centralized. Its architecture relies on a network of data centers located around the world, and its encryption keys for cloud chats are stored in separate jurisdictions. While this design is intended to reduce the risk of forced data surrender, it also means Telegram ultimately retains control over the infrastructure and could be compelled—under legal pressure—to provide access if necessary.

Are Secret Chats Secure Enough?

From a technical standpoint, Secret Chats are likely secure enough for casual private conversations. They offer end-to-end encryption, forward secrecy, and do not log messages on Telegram’s servers. If you and your contact both enable a Secret Chat, and you trust the Telegram app and device security, the chat is reasonably protected from interception. But for users with higher security needs—such as journalists, activists, or those living under oppressive regimes—Telegram’s approach may not be sufficient. The fact that Secret Chats must be manually enabled, and are not available for group messaging, makes Telegram a less reliable choice compared to platforms that enforce encryption by default. Additionally, concerns about MTProto’s design and Telegram’s closed server code continue to fuel debate in the cryptography community. Telegram’s Secret Chats are a step in the right direction—but they are not a comprehensive privacy solution. They provide a useful layer of encryption for one-on-one conversations, but they exist in a larger ecosystem where privacy is optional, not foundational. By contrast, apps like Signal and even WhatsApp provide end-to-end encryption across the board by default, without requiring users to opt in. If you’re using Telegram for its features, communities, and performance, Secret Chats are a valuable tool when you need extra privacy. But if privacy is your top priority and non-negotiable, Telegram—Secret Chats and all—still lags behind the gold standard.