TData vs Session Files: Two-Way Conversion & Safe Session Management

Deconstructing Telegram Session Architecture

Every authorized Telegram client stores cryptographic tokens that prove identity to Telegram Data Centers (DC1 through DC5). However, client implementations persist these credentials in radically different file structures:

1. Telegram Desktop (TData)

TData is the native storage format for Telegram Desktop (C++/Qt). It contains binary serialized files including:

• key_datas: Contains local passcode encryption salts and encrypted auth keys.
• D87FB347802D... (Map files): Stores user settings, active DC IDs, and session metadata.
• Encrypted Qt data streams protected by AES-IGE.

2. Telethon & Pyrogram SQLite Sessions

Python async frameworks persist sessions in SQLite relational databases containing tables:

• sessions: Stores the 256-byte binary auth_key, dc_id, and server_address.
• entities: Caches discovered user IDs, access hashes, and channel usernames.

3. Session+JSON (String Sessions)

A Base64-encoded serialized binary string containing the 256-byte auth key, DC ID, IP address, and port.

The Conversion Challenge: Preventing Auth Key Invalidation

[TData Directory] <─── TelegramGeeks 2-Way Converter ───> [Telethon/Pyrogram SQLite + JSON]
   ├── key_datas
   ├── D87FB347802D...
   └── maps

Improper deserialization causes Telegram servers to trigger AUTH_KEY_UNREGISTERED or revoke active sessions. Common pitfalls include:

1. Device Fingerprint Mismatch: Switching from Windows Desktop TData to an Android API ID without updating system version telemetry.
2. DC Connection Desync: Connecting to DC4 when the auth key was provisioned on DC2.
3. Corrupted Salt Blocks: Failing to decrypt the Qt binary header with correct AES-IGE initialization vectors.

How Telegram Geeks Converts Sessions with 100% Integrity

1. Direct Binary Parser: Decrypts the Qt stream and extracts the raw 256-byte MTProto authorization key.
2. Device Parameter Pairing: Automatically synthesizes matched device properties (app_id, api_hash, device_model, system_version).
3. Silent DC Handshake: Validates connection to Telegram Data Centers without sending interactive user telemetry packets.
4. Bi-Directional Output: Generates clean Pyrogram .session files, Telethon SQLite databases, or standard Windows Desktop TData directories.