Cracking Linksys “Encryption”

Perusing the release notes for the latest Linksys WRT120N firmware, one of the more interesting comments reads:




Firmware 1.0.07 (Build 01)

- Encrypts the configuration file.


Having previously reversed their firmware obfuscation and patched their code to re-enable JTAG debugging, I thought that surely I would be able to use this access to reverse the new encryption algorithm used to