Index of coincidence

ID: index-of-coincidence

The **Index of Coincidence (IC)** is a statistical measure used in cryptography and text analysis to assess the randomness of a text or a ciphertext. It quantifies how likely it is that two randomly selected letters from a string of text will be the same. This measure can help in cryptanalysis, particularly for identifying the type of simple substitution ciphers or for analyzing the properties of encrypted data.

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