Indeed he was.  
His office is preserved in Bletchley Park, with (allegedly) his mug padlocked to a radiator so no-one else could use it.  I even bought my dad a book called Enigma (or something with Enigma in the title) for Christmas last year (from the Bletchley Park shop). (EDIT:  Actually I don't think it was called Enigma, but Colossus).
I considered Miruvor, but couldn't make it work! - uv - very clever.  I couldn't do anything at all with the unseen rays!  I was convinced it started with mir (jewel) but couldn't do the rest ... no luck putting fea on the end (although I did trying suffixing it with the word gin!)
Galadriel, why did you think the T clue began TO?
Time for another, as we're all awake?  
1.  Hama’s initial finale as a gardener’s son.
2.  French cup changes note for a Telerin digit.
3.  Strange the Italian should merge in this elf.
4.  One buttery biscuit that Finrod loved.
5.  Near palindrome and heir apparent.