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Topic: Bazeries cylinder

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	[5.0] The Mechanization of Ciphers
		A Bazeries cylinder consists of a set of roughly 20 to 30 numbered disks, with a different cipher alphabet on the edge of each disk, and a hole in the center of the disks to allow them to be stacked on an axle.
		One major weakness of the Bazeries cylinder is that the offset from the plaintext letter to the ciphertext letter for the cipher alphabet on each disk will be exactly the same.
		Even if the cylinder had 30 disks and a crib only had five letters, Holmes could build up a table of the offsets for each of the 30 disks for the five letter pairs, and use it to greatly narrow down the possibilities for the offset and the disks used for the crib.
	www.vectorsite.net /ttcode_05.html (6471 words)

	Bazeries cylinder -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-04)
		One major weakness of the Bazeries cylinder is that the offset from the plaintext letter to the ciphertext letter for the cipher alphabet on each disc will be exactly the same.
		In the real world, a Bazeries cylinder has 20 or 30 discs, not ten, and it is unlikely that there would be a single crib that would span the entire cylinder.
		Even if the cylinder had 30 discs and a crib only had five letters, Holmes could build up a table of the offsets for each of the 30 discs for the five letter pairs, and use it to greatly narrow down the possibilities for the offset and the discs used for the crib.
	www.absoluteastronomy.com /encyclopedia/B/Ba/Bazeries_cylinder.htm (1629 words)

	M-94 - the free encyclopedia (Site not responding. Last check: 2007-11-04)
		The M-94 was a piece of cryptographic equipment used by the United States army, consisting of several lettered discs arranged as a cylinder.
		The idea for the device was conceived by Colonel Parker Hitt and then developed by MajorJoseph Mauborgne in 1917.Officially adopted in 1922, it remained in use until 1943, replaced by more complex and secure electromechanical rotormachines, particularly the M-209.
		Then, any one of the remaining lines around the circumference of the cylinder was sent as the ciphertext.
	www.world-knowledge-encyclopedia.com /?t=M-94 (330 words)

	The Bazeries Cylinder (Site not responding. Last check: 2007-11-04)
		If the alphabets on the cylinder are poorly chosen, it may be that the fifth letter clockwise from E, for example, can never be some letters, and is one particular letter several times.
		The alphabets on the M-94, a version of the Bazeries cylinder made from aluminum, and used by the U.S. during the Second World War, were chosen to be part of a Latin square to be more resistant to a de Viaris attack.
		Ideally, if one were using 25 cylinders for a 26-character alphabet, one would like a sequence such that, if one aligns any one letter to form a solid row of that letter, then the remaining 25 letters on the 25 cylinders are, in each case, a Latin square.
	www.cs.sunyit.edu /~gloor/reading_room/crypto/FoodForThought/compendium/ro020101.htm (994 words)

	Étienne Bazeries - free-definition (Site not responding. Last check: 2007-11-04)
		He is best known for developing the "Bazeries Cylinder", an improved version of Thomas Jefferson's cipher cylinder.
		Bazeries was born in Port-Vendres, France, the son of a mounted policeman.
		Bazeries continued his cryptanalytic work there even after he retired from the Army in 1899, assisting in solving German military ciphers during World War I.
	www.free-definition.com /Etienne-Bazeries.html (328 words)

	Jefferson disk Information
		A Bazeries cylinder consists of a set of roughly 20 to 30 numbered discs, with a different cipher alphabet on the edge of each disc, and a hole in the centre of the discs to allow them to be stacked on an axle.
		The Bazeries cylinder was the basis for the US "M-94" cipher machine, which was introduced in 1922 and derived from work by Parker Hitt.
		Even if the cylinder had 30 discs and a crib only had five letters, Holmes could build up a table of the offsets for each of the 30 discs for the five letter pairs, and use it to greatly narrow down the possibilities for the offset and the discs used for the crib.
	www.bookrags.com /wiki/Jefferson_disk (1584 words)

	The Bazeries Cylinder (Site not responding. Last check: 2007-11-04)
		If the alphabets on the cylinder are poorly chosen, it may be that the fifth letter clockwise from E, for example, can never be some letters, and is one particular letter several times.
		The alphabets on the M-94, a version of the Bazeries cylinder made from aluminum, and used by the U.S. during the Second World War, were chosen to be part of a Latin square to be more resistant to a de Viaris attack.
		Ideally, if one were using 25 cylinders for a 26-character alphabet, one would like a sequence such that, if one aligns any one letter to form a solid row of that letter, then the remaining 25 letters on the 25 cylinders are, in each case, a Latin square.
	www.quadibloc.com /crypto/ro020101.htm (994 words)

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