Cloud vs secret chats
Cloud chats: encrypted client-to-server, decrypted + stored at server. Accessible from any device. Default.
Secret chats: E2E via MTProto with PFS. Single-device. Optional.
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Cloud vs secret chats
Cloud chats: encrypted client-to-server, decrypted + stored at server. Accessible from any device. Default.
Secret chats: E2E via MTProto with PFS. Single-device. Optional.
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MTProto transport
Custom protocol atop TCP/UDP. Binary encoding. Focused on mobile efficiency + reconnection.