Disclaimer: This information is provided for educational purposes and for the recovery of your own configurations. Decrypting configuration files without authorization from the device owner or the ISP violates computer security laws in most jurisdictions.
How to Decrypt ZTE config.bin 1. What is config.bin ? Most modern ZTE routers (F660, F680, F609, etc.) allow you to backup your configuration. The resulting file is usually named config.bin . However, this is not a raw binary dump of the settings. ZTE encrypts and compresses this file to prevent users from reading sensitive data like:
ISP PPPoE credentials (username/password). Wi-Fi passwords (PSK). Router admin passwords . TR-069 remote management URLs .
2. Encryption Method The encryption used is not military-grade, but a custom obfuscation/encryption algorithm. The key structure is usually: Decrypt Zte Config.bin
First 8 bytes : A fixed magic header (e.g., ZTE cfg or ZTEcfg ) – this is not the key . Remaining bytes : XOR-based encryption or a simple block cipher, often using a static key derived from the device model or a known constant.
3. Prerequisites for Decryption You will need:
The config.bin file extracted from your ZTE router. A Linux or Windows machine with Python installed. A hex editor (e.g., HxD or 010 Editor) for manual inspection. What is config
4. Manual Decryption Methods Method A: Using ztecfg Tool (Linux / Python) Several open-source tools exist. The most common is ztecfg.py . Steps:
Download the script from GitHub (search for "ztedump" or "zte cfg decrypt"). Run: python3 ztecfg.py -d config.bin output.xml
If successful, output.xml will contain the router's settings in plaintext. However, this is not a raw binary dump of the settings
If it fails: The key may be specific to your router model. You may need to extract the key from the router's firmware. Method B: Manual XOR Bruteforce (Advanced) If automated tools fail, the encryption is often a repeating XOR key.
Open config.bin in a hex editor. Skip the first 8 bytes (header). Look for repeating patterns. Many ZTE routers use a 16-byte XOR key. You can attempt to extract the key if you know a plaintext string that must exist in the config (e.g., admin or http:// ). Use a script to XOR the ciphertext with the guessed key.