Ok, so I was thinking a bit. For anyone with the iPhone DEV program, is it possible to digitally sign Cydia and Installer, then re-package them into an ipsw, and maybe exploit iTunes to not verify the MD5 hash on the package? (The Verifying Firmware part...) iTunes would be doing the work of the jailbreak, just like the iTunes firmware exploit recently done. I know, they've fixed that. But, in general, would this be possible?