Solving a cryptogram
In a cryptogram, every letter has been swapped for a different letter, and the same swap is used all the way through. There is no key to find, just a lot of small guesses. CacheCrack gives you a box for each cipher letter, with the most common ones first, and fills in the message as you type.
Good places to start: the most common cipher letter is often E or T. One-letter words are almost always A or I. A three-letter word that shows up a lot is probably THE or AND. Letters you have not solved yet show as underscores, and CacheCrack warns you if you use the same answer for two cipher letters.
Example
Gsv xzxsv rh fmwvi gsv yirwtv solves to The cache is under the bridge.