There's a lot of crap in this thread, pretty unbelievable really.
Anyway, security on consoles is achieved through obscurity or public/private key encryption. Cracking obscurity is hard if you don't have the right tools and knowledge, but if for example you know how to de-pot chips, have a very intensive microscope and somehow to scan the whole chip at a clear level and have enough time to search the chip, you'd be able to de-obscurificate it and crack the encryption. Some academic did that with the PS3 and xbox 360 and got some private keys somehow.
Public/private key is much harded because you need an exploit or the private key really.
decapping the chips were never done on xbox or ps3 CPUs,it was all software hacking. only the dvd drive ic was decaped. you can decap these main CPUs all you want, unless you have access to expensive tools,then theres no way you're going to be able to work on 40nm parts. the maximum you can see the transistors on optically with a microscope is 350nm. anything smaller and you are exceeding the wavelength of light. if you want to rent time on a focused ion beam workstation,get ready to pay $400+ an hour using such devices. And even then, there are security meshes,5+ layers,light sensors, encrypted busses,invisible roms, all which would take an enourmous amount of time to figure out.