Frequency Analysis & IOC
©Copyright 2017-2018 Christopher Catlin
Cipher Text
Type or paste your cipher text here. The letter frequency distribution will be rendered in the graph below. The deviance values show how your sample deviates from typical english text (shown in grey on the graph). A low overall deviance (< 100) indicates that the text, if encoded, probably uses a monoalphabetic cipher. Similarly, an Index of Coincidence (IOC) value close to 0.07 is indicative of English text. Other written languages range between 0.07 and approximately 0.05. Values beyond this indicate cipher text that isn't using a monoalphabetic cipher.
Frequency Analysis