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The method of perforated sheets was a cryptologic technique used by the Polish Cipher Bureau before World War II, and during the war by British cryptologists at Bletchley Park, to decrypt messages enciphered on German Enigma machines. Cryptography (or cryptology; from Greek grc κρυπτός kryptos, "hidden secret" and grc γράφω gráphō, "I write" Poland (Polska officially the Republic of Poland The Biuro Szyfrów ( Polish for " Cipher Bureau " was the Polish Interwar agency charged with both Cryptography (the World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including Bletchley Park, also known as Station X, is an estate located in the town of Bletchley, in Buckinghamshire, and (since 1967 part of Milton Keynes In Cryptography, a cipher (or cypher) is an Algorithm for performing Encryption and Decryption &mdash a series of well-defined steps The Enigma machine is any one of a family of related electro-mechanical Rotor machines used to generate Ciphers for the Encryption and decryption of The "perforated sheets" were invented about October 1938 by Polish Cipher Bureau cryptologist Henryk Zygalski, and accordingly are sometimes known as Zygalski sheets. Henryk Zygalski ( 1906 - 1978 was a Polish Mathematician and Cryptologist who worked at breaking German Enigma ciphers before and during
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Method
The method involved superposing a series of sheets — each containing a grid of holes in various positions — and aligning them in the proper manner with respect to each other, while shining a lamp underneath. Using this procedure, a large number of possibilities for the Enigma daily keys could be eliminated. If the settings were correct and sufficient data were available, a single aperture would remain, which indicated the solution.
Like Marian Rejewski's "card-catalog" method, developed using his "cyclometer," the "perforated-sheet" procedure was independent of the number of commutator plug connections. Marian Adam Rejewski ( 16 August 1905 &ndash 13 February 1980 was a Polish Mathematician and cryptologist who in 1932 solved the Enigma machine The cyclometer was a cryptologic device designed in the end of 1936 by Marian Rejewski, of the Polish Cipher Bureau 's German section (BS-4 to facilitate In Mathematics, the commutator gives an indication of the extent to which a certain Binary operation fails to be Commutative.
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Use and manufacture
The Cipher Bureau's manual manufacture of the sheets, which was done by the mathematician-cryptologists themselves using razor blades, was very time-consuming; by December 15, 1938, only 1/3 of the job had been finished. The Enigma machine is any one of a family of related electro-mechanical Rotor machines used to generate Ciphers for the Encryption and decryption of This article contains technical details about the rotors of the Enigma machine. The Enigma machines were a family of portable Cipher machines The Biuro Szyfrów ( Polish for " Cipher Bureau " was the Polish Interwar agency charged with both Cryptography (the The Bomba, or Bomba kryptologiczna ( Polish for " Bomb " or " Cryptologic bomb " was a special-purpose Enigma "doubles" were machines produced by the Polish Cipher Bureau, based on Marian Rejewski 's reconstruction of The cyclometer was a cryptologic device designed in the end of 1936 by Marian Rejewski, of the Polish Cipher Bureau 's German section (BS-4 to facilitate Bletchley Park, also known as Station X, is an estate located in the town of Bletchley, in Buckinghamshire, and (since 1967 part of Milton Keynes Banburismus was a process invented by Alan Turing at Bletchley Park in England during the Second World War. John W Herivel (born 1918 is a British Science historian and former World War II Codebreaker at Bletchley Park. In the History of cryptography, the Bombe was an electromechanical device used by British Cryptologists to help break German Enigma Hut 6 was a wartime section of Bletchley Park tasked with the solution of German Army and Air Force Enigma machine ciphers Hut 8 was a section at Bletchley Park (the British World War II Codebreaking station tasked with solving German naval Enigma messages PC Bruno was a Polish - French intelligence station that operated outside Paris during World War II. ULTra ("Urban Light Transport" is a Personal rapid transit system from Advanced Transport Systems Ltd a company based in Cardiff, Wales. The Biuro Szyfrów ( Polish for " Cipher Bureau " was the Polish Interwar agency charged with both Cryptography (the Enigma "doubles" were machines produced by the Polish Cipher Bureau, based on Marian Rejewski 's reconstruction of The grill (ruszt in Cryptology, was a method used chiefly early on by the mathematician-cryptologists of the Polish Cipher Bureau in decrypting German In Cryptography, the clock was a method devised by Polish mathematician-cryptologist Jerzy Różycki, at the Polish General Staff's Cipher Bureau The cyclometer was a cryptologic device designed in the end of 1936 by Marian Rejewski, of the Polish Cipher Bureau 's German section (BS-4 to facilitate The card catalog, or "catalog of characteristics" in Cryptography, was a system designed and first completed about 1935 by Polish Cipher Bureau The Bomba, or Bomba kryptologiczna ( Polish for " Bomb " or " Cryptologic bomb " was a special-purpose The method of perforated sheets was a cryptologic technique used by the Polish Cipher Bureau before World War II, and during the war by The Lacida (or LCD) was a rotor cipher machine designed before World War II by the Polish Cipher Bureau for wartime use by Polish The Saxon Palace ( Polish: Pałac Saski) was one of the most distinctive buildings in prewar Warsaw, Poland. Kabaty ( is the southernmost neighborhood of the city of Warsaw, located in its Ursynów district PC Bruno was a Polish - French intelligence station that operated outside Paris during World War II. Cadix was the Codename of a World War II clandestine Allied intelligence center that operated at Uzès, on the Mediterranean Maksymilian Ciężki (1899 in Samter, (Szamotuły Province of Posen &ndash November 9, 1951;) was the head of the German section of Jan Józef Graliński ( February 8, 1895 – January 9, 1942) was chief of the Polish General Lt Col Jan Kowalewski (1892–1965 was a Polish cryptologist, intelligence officer, Engineer, Journalist, military commander and creator Lt Col Karol Gwido Langer (died March 30, 1948) was chief of the Polish General Staff 's Cipher Bureau from at least mid-1931 Stanisław Leśniewski ( March 30 1886 – May 13 1939) was a Polish Mathematician, Philosopher and Logician Stefan Mazurkiewicz (born September 25 1888 in Warsaw, then Russian Empire &ndash died June 19 1945, Grodzisk Wiktor Michałowski (died 1973) was a Polish Army officer who worked at the Interbellum Polish Cipher Bureau 's German section B Antoni Palluth, born in Pobiedziska, Greater Poland (then in the German Empire) was a civilian employee in the German section ( BS-4) of the Major Franciszek Pokorny was a Polish Army officer who headed the Polish General Staff 's Cipher Bureau before Major (eventually Lt Marian Adam Rejewski ( 16 August 1905 &ndash 13 February 1980 was a Polish Mathematician and cryptologist who in 1932 solved the Enigma machine Jerzy Witold Różycki (pronounced ['jεʒɨ ru'ʒɨʦki]; Olshana, near Kiev, Ukraine, July 24, 1909 — January Wacław Franciszek Sierpiński ( March 14 1882 — October 21 1969) (ˈvaʦwaf fraɲˈʨiʂɛk ɕɛrˈpʲiɲskʲi a Polish Mathematician Piotr Smoleński (died January 9, 1942) was a Cryptologist in the Russian section ( B Henryk Zygalski ( 1906 - 1978 was a Polish Mathematician and Cryptologist who worked at breaking German Enigma ciphers before and during Events 533 - Byzantine general Belisarius defeats the Vandals, commanded by King Gelimer, at the Battle of Year 1938 ( MCMXXXVIII) was a Common year starting on Saturday (link will display the full calendar of the Gregorian calendar. On that date, the Germans introduced rotors IV and V, thus increasing the labor of making the sheets tenfold, since ten times as many sheets were now needed (for the now 60 possible combinations of sequences, in an Enigma machine, of 3 rotors selected from among the now 5).
In late July 1939, a month before the outbreak of World War II, the Polish General Staff's Cipher Bureau disclosed to their French and British allies, at Warsaw, their cryptologic achievements in breaking Enigma ciphers. A military staff is a group of officers and enlisted personnel that provides a bi-directional flow of information between a commander and subordinate units This article is about the country For a topic outline on this subject see List of basic France topics. See also Kingdom of Great Britain Great Britain (Breatainn Mhòr Prydain Fawr Breten Veur Graet Breetain is the larger of the two main islands Warsaw (Warszawa; also known by other names) is the Capital and Largest city of Poland. Part of the disclosures involved Zygalski's "perforated-sheet" method.
With the assistance of machinery, the production of two complete sets of perforated sheets was undertaken at Bletchley Park in England by a section headed by John R. F. Jeffreys[1][2]. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland John R F Jeffreys (died early 1941 was a British Mathematician and World War II Codebreaker. The sheets were known at Bletchley as Netz (from Netzverfahren, "net method"), although they were later remembered by Gordon Welchman as "Jeffreys sheets"; this term, however, referred to another catalogue produced by Jeffreys's section[1]. (William Gordon Welchman ( June 15, 1906 – October 8, 1985) was a British mathematician and World War II Codebreaker
The first set was completed in late December 1939, and on 28 December 1939, part of the second set was delivered to the Polish cryptologists[2], who had by then escaped from German-overrun Poland to PC Bruno outside Paris, France. Events 1065 - Westminster Abbey is Consecrated. 1308 - The reign of Emperor Hanazono, Emperor of PC Bruno was a Polish - French intelligence station that operated outside Paris during World War II. The remaining sheets were completed on 7 January 1940, and were couriered by Alan Turing to France shortly thereafter[2]. Events 1325 - Alfonso IV becomes King of Portugal. 1558 - France takes Calais, the last continental Alan Mathison Turing, OBE, FRS (ˈt(jʊ(ərɪŋ (23 June 1912 &ndash 7 June 1954 was an English Mathematician "With their help," writes Polish cryptologist Marian Rejewski, "we continued solving Enigma daily keys. See also CategoryCryptographers for an exhaustive list Pre twentieth century Charles Babbage, UK, 19th century Mathematician "[3] The sheets were used by the Poles to make the first wartime decryption of an Enigma message on 17 January 1940[2]. Events 38 BC - Octavian marries Livia Drusilla. 1287 - King Alfonso III of Aragon invades Minorca
In May 1940, the Germans once again completely changed the procedure for enciphering message keys (with the exception of a Norwegian network). As a result, Zygalski's sheets were rendered completely useless.
See also
- Bomba - Cryptologic bomb: a machine designed about October 1938 by Marian Rejewski to facilitate the retrieval of Enigma keys. The Bomba, or Bomba kryptologiczna ( Polish for " Bomb " or " Cryptologic bomb " was a special-purpose Marian Adam Rejewski ( 16 August 1905 &ndash 13 February 1980 was a Polish Mathematician and cryptologist who in 1932 solved the Enigma machine
- Bombe: a machine, inspired by Rejewski's "Bomba", that was used by British and American cryptologists during World War II. In the History of cryptography, the Bombe was an electromechanical device used by British Cryptologists to help break German Enigma
- Cryptanalysis of the Enigma. The Enigma machines were a family of portable Cipher machines
- Punch card.
- Enigma (2001 film)
References
- ^ a b Ralph Erskine, "The Poles Reveal their Secrets: Alastair Denniston's Account of the July 1939 Meeting at Pyry", pp. Enigma is a 2001 film set in World War II. It stars Dougray Scott and Kate Winslet and is based on the novel Enigma 294-305, Cryptologia 30(4), December 2006
- ^ a b c d Ralph Erskine, "Breaking Air Force and Army Enigma", p. 53 in Action this Day, edited by Ralph Erskine and Michael Smith, 2001
- ^ Rejewski, in Kozaczuk's Enigma 1984, p. Władysław Kozaczuk ( December 23, 1923 &ndash September 26, 2003) was a Polish Army colonel and a military and intelligence 243; more from him about the perforated sheets, on pp. 287-89 and elsewhere
External links
- Javascript demonstration of Zygalski sheets
- "Polish Enigma Double"
- About the Enigma (National Security Agency)
- "The Enigma Code Breach" by Jan Bury
- The „Enigma” and the Intelligence
- www.enigmahistory.org
- "Codebreaking and Secret Weapons in World War II" By Bill Momsen
- A Brief History of Computing Technology, 1930 to 1939
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