Kasiski's Test: Couldn't the Repetitions be by Accident?

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Kasiski's Test: Couldn't the Repetitions be by Accident?

subject

Accident (fallacy)Repetition (rhetorical device)Applied Mathematics Accidental Ciphertext Statistics Arithmetic Birthday problem Computer Science Applications Mathematics Test (assessment)

description

Abstract In searching for repetitions in a periodic polyalphabetic ciphertext, we usually find several true (causal) repetitions that give information about the period. But we also find some accidental repetitions at distances unrelated to the period which may mislead the cryptanalyst. A simple formula shows that these accidents are rather unlikely.

year	journal	country	edition	language
2006-12-01	Cryptologia

https://doi.org/10.1080/01611190600803819

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