What is a Caesar cipher?

A Caesar cipher moves every letter the same number of places along the alphabet. With a shift of 3, A becomes D, B becomes E, and Z wraps around to C. It is named after Julius Caesar, who is said to have used it.

Because there are only 25 possible shifts, you do not need to know the key. With "Try all shifts" on, CacheCrack tries every one and puts the result that looks most like English at the top. Turn it off to encode or decode with one specific shift.

Example

Wkh wuhdvxuh lv exulhg with shift 3 decodes to The treasure is buried.

ROT13, ROT5, ROT18 and ROT47

ROT13 is a Caesar shift of 13, and doing it twice gets you back where you started. ROT5 does the same trick with digits, ROT18 combines the two, and ROT47 rotates every printable character, symbols included. Pick them from the Rotate menu.