The free60 wiki which aim to document ways to have a linux booting on XBOX360 is since 2 weeks online, and has already some interesting info. (some guys are really a lot crazier than me 😉 )
I came one more time to XBOX-linux.org which has a page for describing how the first XBOX was hacked. Very technical but a mus to read for all security geek.
The Hidden Boot Code of the Xbox From Xbox-Linux or "How to fit three bugs in 512 bytes of security code"
… Microsoft’s engineers first seem to have thought that the secret key would never be revealed: security by obscurity. This explains why the decrypted code did not get hashed. Once the secret key was known, anyone could decrypt, patch and reencrypt the flash contents. … And how the chain of trust was breaked … The design of the first MCPX was very wrong, and the implementation was catastrophic. The design of the second version was a lot better, but the implementation was not. Without the various security holes (Visor and MIST bugs as well as possibly more) and with a working hash function, the system would have been pretty secure. Encrypting the ROM contents with a secret key, i.e. security by obscurity, simply does not work if the key travels over a bus that can be sniffed.
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