[Deque]

I don't know if you should be shortening rot13 with rot, base64 with base... What if we add other rot versions or other bases based algorithms? rev = reverse is fine, but for the others I don't think so. Also, you're taking away 2 chars, I think the user could manage the effort.

rot13 is the most common case of all rot algorithms as well is base64 (i.e. compared to base32), so I will leave those abbreviations, no matter if other algorithms follow.
I myself find it far more easy to type base than base64, because I have to stretch the fingers very far to get to the numbers. I also tend to forget the numbers for hazz, zong and so on, because they are arbitrary (those are still base64 algorithms, just with other alphabets).

It's just a dictionary with abbreviations, I can change that easily if we get more algorithms with similar names. I don't see the problem.