Are there any distros out there that use some flavor of an SHA-2 encryption algorithm as opposed to MD5? MD5 can be broken in minutes on a laptop these days - that's not really good enough for me I don't think.

(I'm aware SHA-2 is a pseudo-phrase)

Also, if you have a running system w/ MD5, how do you switch the algorithm to start encrypting in SHA-2, or would that not be elegant/possible?

Ideally, an SHA-2 would be the algorithm from the get-go.