from the rated-e-for-enigma dept.
Spudley writes "I just heard on the BBC that the British Government's not-so-secret code breaking organisation, GCHQ, has launched a little Christmas crypto challenge for all you budding secret agents. Should be fun to try it out... even if you're not brave enough to actually send in an entry."
How can you do 'New Math' problems with an 'Old Math' mind?
-- Charles Schulz