Index of Coincidence

Index of Coincidence (IC) is the probability of two randomly selected characters being the same. This can be used to determine whether text is readable or random, with English text having an IC of around 0.066. IC can therefore be a sound method to automate frequency analysis. Index of Coincidence lives in the Others category of the fx menu.

Parameter

Parameter	Type	Required	Default	Description
Input	string	yes	—	Value to transform. Previous step output or a literal.

Input is the primary value (previous step output or a literal).

Returned value

Type	Description
number	Result of the Index of Coincidence transformation.

Example

Run Index of Coincidence

Index of Coincidence (IC) is the probability of two randomly selected characters being the same. Adjust optional parameters when the defaults do not match your payload.

1. Set Input to the value to transform (previous step output or a literal).

2. Confirm Output value shows the transformed result.