(oh, it's possible for sure, I played with it a while, it's a very easy system once you find out - I just find it hard to believe you went through all possible keys just to find which worked. Especially since some of the more logical ones don't work)
...it's even more impossible to believe that Yuna would actually put that information in the coded text that reveals her name.

What would it say? "Im a Protoss posing as [name] and I will kill you in your sleep"? That's just stupid. We were only asked for the name plus some padding (as in "I go by the name [name] and I'm the best Marine around" ). Anything else we would want to divulge could have gone in a second sentence. If what you say is true, as soon as we decoded, we would know she was not Terran and she would be executed. I find that hard to believe.

(Unless she's suicidal - which is a role, right? In fact I believe you had that role before, didn't you? The mad Cairienin lord?)

So: show me proof that she's Protoss (for example: how did you break the key? what is the key? what do you say the message says?).

Until then, it's a scum move to do this: Vote: ranagrande