Étienne Bazeries (21 August 1846, in Port Vendres – 7 November 1931, in Noyon) was a French military

cryptanalyst Cryptanalysis (from the Greek ''kryptós'', "hidden", and ''analýein'', "to analyze") refers to the process of analyzing information systems in order to understand hidden aspects of the systems. Cryptanalysis is used to breach cryptographic se ...

active between 1890 and the

First World War World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

. He is best known for developing the " Bazeries Cylinder", an improved version of

Thomas Jefferson Thomas Jefferson (, 1743July 4, 1826) was an American Founding Fathers of the United States, Founding Father and the third president of the United States from 1801 to 1809. He was the primary author of the United States Declaration of Indepe ...

cipher In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is ''encipherment''. To encipher or encode i ...

cylinder. It was later refined into the US Army

M-94 The M-94 was a piece of cryptographic equipment used by the United States Army, consisting of several lettered discs arranged as a cylinder. It was also employed by the US Navy, under the name CSP 488. The device was conceived by Colonel Parke ...

cipher device. Historian David Kahn describes him as "''the great pragmatist of cryptology. His theoretical contributions are negligible, but he was one of the greatest natural cryptanalysts the science has seen.''" (Kahn 1996, p244) Bazeries was born in

Port-Vendres Port-Vendres (; ; ) is a Communes of France, commune in the Pyrénées-Orientales Departments of France, department, southeastern France. A typical Mediterranean Sea, Mediterranean fishing port, situated near the Spanish border on the Côte Vermei ...

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

, the son of a mounted

policeman A police officer (also called policeman or policewoman, cop, officer or constable) is a warranted law employee of a police force. In most countries, ''police officer'' is a generic term not specifying a particular rank. In some, the use of ...

. In 1863 he enlisted in the army, and fought in the

Franco-Prussian War The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 Janua ...

, where he was taken

prisoner A prisoner, also known as an inmate or detainee, is a person who is deprived of liberty against their will. This can be by confinement or captivity in a prison or physical restraint. The term usually applies to one serving a Sentence (law), se ...

, although he later managed to escape disguised as a

bricklayer A bricklayer, which is related to but different from a mason, is a craftsperson and tradesperson who lays bricks to construct brickwork. The terms also refer to personnel who use blocks to construct blockwork walls and other forms of maso ...

. In 1874 he was promoted to

lieutenant A lieutenant ( , ; abbreviated Lt., Lt, LT, Lieut and similar) is a Junior officer, junior commissioned officer rank in the armed forces of many nations, as well as fire services, emergency medical services, Security agency, security services ...

, and sent to

Algeria Algeria, officially the People's Democratic Republic of Algeria, is a country in the Maghreb region of North Africa. It is bordered to Algeria–Tunisia border, the northeast by Tunisia; to Algeria–Libya border, the east by Libya; to Alger ...

in 1875. He returned to France the following year and married Marie-Louise-Elodie Berthon, with whom he would father three daughters: Césarine, Fernande and Paule. He apparently became interested in cryptography through solving

cryptogram A cryptogram is a type of puzzle that consists of a short piece of encrypted text. Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand. Substitution ciphers where each letter is replaced by ...

s in newspapers' personal columns, and soon applied his cryptanalytic skills in a military context when, in 1890, he solved messages enciphered with the official French military transposition system, causing the War Ministry to change to a new scheme. In an effort to prompt reform within the government and enhance national security, Bazeries further exposed weaknesses in French cipher systems. In 1891, news of his talent had spread, and he began work for the Ministry of Foreign Affairs' Bureau du Chiffre. 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 World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

. However, many of Bazeries recommendations to the government for improvements in official cipher systems met severe bureaucracy and rebuffs, which became a constant source of frustration for him in an otherwise illustrious career.Candela. ''The Military Cipher of Commandant Bazeries'', 4-10. He retired in 1924, aged 78. In the 1890s he broke a famous nomenclator system called the " Great Cipher", created by the Rossignols in the 17th century. One of the messages referred to the famous

Man in the Iron Mask The Man in the Iron Mask (; died 19 November 1703) was an unidentified prisoner of state during the reign of Louis XIV of France (1643–1715). The strict measures taken to keep his imprisonment secret resulted in a long-lasting legend about ...

and provided a possible solution to the mystery. His influential 1901 text ''Les Chiffres secrets dévoilés'' ("Secret ciphers unveiled") is considered a landmark in

cryptographic Cryptography, or cryptology (from "hidden, secret"; and ''graphein'', "to write", or '' -logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adversarial behavior. More gen ...

literature.

References & Footnotes

References

* Candela, Rosario, ''The Military Cipher of Commandant Bazeries''. New York: Cardanus Press, 1938. This book provided good detail of Bazaries as a cryptanalyst. * Kahn, David, ''The Codebreakers''. 1967, 2d ed. 1996. ()

Footnotes

{{DEFAULTSORT:Bazeries, Etienne 1846 births 1931 deaths French cryptographers 19th-century cryptographers Man in the Iron Mask Military history of France 20th-century cryptographers