NSA Code Breaking Challenge

The NSA have launched a twitter code breaking challenge (perhaps in need of some positive publicity...) - the code last week was pretty straightforward - a substitution cipher - this one looks a little harder:



Rimfinnpeqcnvqauuagcrdokvdisndrdcrpigaisacpsdffaic vhakcfdqfpqdetrkilfaecnpqacakqisacpfampoacfimannic fakdumfalddnraprf


http://ift.tt/1nBYMIM



I've tried various things so far, but it doesn't seem to be a substitution cipher or Caesar shift or transposition. It may be a Vigenere - and there is a repeated string isacp - but trying a few simple keywords doesn't seem to yield anything.



The counton website is quite useful for some online code skills:



http://ift.tt/1gxppHr



Any ideas? :)



MOD PS Can this remain in SMMT - code making and breaking is a branch of mathematics - so please don't ship this off to the puzzles section!

via JREF Forum http://ift.tt/QCwYpj