Need some tips on in memory patching of a .Net dll

[Sailor_EDA]

I've been reading up on strong-naming dll and I have a question. If I alter the dll, can I resign it, does it have to be with the original PublicPrivate key used by the vendor to sign the dll or can I produce my own key? I haven't tried it out as yet and that is probably the best way to find out but I was just checking if at lest in theory it should work.

This is what I've been referring to:
hxxp://msdn.microsoft.com/en-us/library/6f05ezxy(v=vs.80).aspx