Sony faced a setback in its campaign to control what software can run on its PlayStation 3 after hackers published one of the cryptographic keys that forms the core of the security scheme locking down the game console.
The so-called LV0 key, released by a crew calling itself "The Three Musketeers," grants access to the one of the most sensitive parts of the PS3. Its availability should make it easier for hackers and modders to work around restrictions Sony places on the console. The key can be used to decrypt future security updates Sony issues for the console and to incorporate those changes into custom firmware packages not authorized by the Japan-based game maker. Sony has long discouraged the use of custom firmware by, among other things, blocking consoles that use them from connecting to the PlayStation Network.
The Three Musketeers said they discovered the LV0 key some time ago and only published it after a separate hacking group was using the code to build and sell its own custom firmware called BlueDiskCFW. Their post appears to be available here.