A simple cipher which merely shuffles the alphabet such that (say) A is represented by Q and B by G is child's play for a codebreaker. The plethora of Q in a message immediately suggests itself as a SENORITA letter and, for example, what else could ZQPQTQPQWQXQZQ by other than TARAMARASALATA? Notwithstanding such as KRALL and AARDVARK, a double Q denies the prospect of Q being A, but it could be virtually any of the other popular letters of the AEINORST alphome, and all one does is consider its occurrences elsewhere in the message.
"Disguising the KGB Senorita,"
Word Ways: Vol. 31
, Article 8.
Available at: http://digitalcommons.butler.edu/wordways/vol31/iss1/8