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Topic: Kasiski examination

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	Cryptography (Site not responding. Last check: 2007-11-01)
		The interval between plaintext or ciphertext repetitions is noted throughout the cryptogram, factored and the commonality of the factor is a good indication of the key and number of alphabets used to encipher the original methods.
		The fall of the Vigenere family is attributed to Kasiski's examination.
		If there are several long repetitions in the cipher text of an unknown system, the intervals between the initial letters of these repetition have a common factor, this factor represents the number of alphabets used to encipher the message and the exact number of repetitions of the key.
	www.threaded.com /cryptography10.htm (11926 words)

	- mjidor - (Site not responding. Last check: 2007-11-01)
		Examination of the message discloses a bipartite alphabet cipher with only ten different letters used.
		The perfect randomness of the one time system nullifies any efforts to reconstruct the key or plain text via horizontal or lengthwise analysis, via cohesion, via re-assembly (such as Kasiski or Kerckhoff's columns) via repeats or via internal framework erection.
		Brute force (trial and error) might bring out the true plaintext but it would also yield every other text of the same length, and there is no way to tell which is the right one.
	www.mjidor.com /lektion3.shtml (6127 words)

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