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Fritz!Box Config Decrypt

Read and decrypt Fritz!Box .export configuration files locally in your browser. Extract passwords, SIP credentials, VPN keys and network settings.

100% local — Your file and password never leave your device. All decryption uses the browser's built-in Web Crypto API.

How does the decryption work?

AVM Fritz!Box encrypts its export files using a two-layer scheme:

  1. The export password is hashed with MD5 to derive a 256-bit key (zero-padded).
  2. A random session key is encrypted in the Password= header field using AES-256-CBC.
  3. All $$… values in the file are decrypted with that session key.
  4. Each encrypted value contains a partial MD5 checksum for integrity verification.

This tool is based on the reverse-engineering work by PeterPawn/decoder.