Great job – NSA CryptoChallenge Review

This is a fun app with some great trivia tidbits. I only have a couple of suggestions to make it stellar. First, the advanced mode only uses monoalphabetic substitutions. It would be nice if there was an advanced mode with polyalphabetic substitutions, columnar transposition, railfence, playfair, and maybe even RSA (with more manageable factoring). Also, freq analysis and other crypto tools/tutorials would be awesome. But, absent these features, great job still! Highly recommended.
Review by JimmyTheHook on NSA CryptoChallenge.