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Frequency analysis

Index Frequency analysis

In cryptanalysis, frequency analysis (also known as counting letters) is the study of the frequency of letters or groups of letters in a ciphertext. [1]

Table of Contents

  1. 54 relations: A Void, Abraham Sinkov, Al-Kindi, Alice and Bob, Arabic, Arabs, Arthur Conan Doyle, Axis powers, Backtracking, Bigram, Charles Wheatstone, Cicco Simonetta, Ciphertext, Ciphertext-only attack, Classical cipher, Computer, Crossword, Cryptanalysis, Cryptogram, Cryptologia, Edgar Allan Poe, English language, Enigma machine, Ernest Vincent Wright, Etaoin shrdlu, Gadsby (novel), Georges Perec, IBM, Index of coincidence, Italian language, Latin, Leon Battista Alberti, Letter frequency, Lipogram, Outline of cryptography, Plaintext, Playfair cipher, Polyalphabetic cipher, Polygraphic substitution, Polymath, Quran, Renaissance, Rotor machine, Sherlock Holmes, Signal Intelligence Service, Software, Substitution cipher, The Adventure of the Dancing Men, The Gold-Bug, Trigram, ... Expand index (4 more) »

  2. Frequency distribution
  3. Quantitative linguistics

A Void

A Void, translated from the original French La Disparition ("The Disappearance"), is a 300-page French lipogrammatic novel, written in 1969 by Georges Perec, entirely without using the letter e, following Oulipo constraints.

See Frequency analysis and A Void

Abraham Sinkov

Abraham Sinkov (August 22, 1907 – January 19, 1998) was a US cryptanalyst.

See Frequency analysis and Abraham Sinkov

Al-Kindi

Abū Yūsuf Yaʻqūb ibn ʼIsḥāq aṣ-Ṣabbāḥ al-Kindī (أبو يوسف يعقوب بن إسحاق الصبّاح الكندي; Alkindus) was an Arab Muslim polymath active as a philosopher, mathematician, physician, and music theorist.

See Frequency analysis and Al-Kindi

Alice and Bob

Alice and Bob are fictional characters commonly used as placeholders in discussions about cryptographic systems and protocols, and in other science and engineering literature where there are several participants in a thought experiment.

See Frequency analysis and Alice and Bob

Arabic

Arabic (اَلْعَرَبِيَّةُ, or عَرَبِيّ, or) is a Central Semitic language of the Afroasiatic language family spoken primarily in the Arab world.

See Frequency analysis and Arabic

Arabs

The Arabs (عَرَب, DIN 31635:, Arabic pronunciation), also known as the Arab people (الشَّعْبَ الْعَرَبِيّ), are an ethnic group mainly inhabiting the Arab world in West Asia and North Africa.

See Frequency analysis and Arabs

Arthur Conan Doyle

Sir Arthur Ignatius Conan Doyle (22 May 1859 – 7 July 1930) was a British writer and physician.

See Frequency analysis and Arthur Conan Doyle

Axis powers

The Axis powers, originally called the Rome–Berlin Axis and also Rome–Berlin–Tokyo Axis, was a military coalition that initiated World War II and fought against the Allies.

See Frequency analysis and Axis powers

Backtracking

Backtracking is a class of algorithms for finding solutions to some computational problems, notably constraint satisfaction problems, that incrementally builds candidates to the solutions, and abandons a candidate ("backtracks") as soon as it determines that the candidate cannot possibly be completed to a valid solution.

See Frequency analysis and Backtracking

Bigram

A bigram or digram is a sequence of two adjacent elements from a string of tokens, which are typically letters, syllables, or words.

See Frequency analysis and Bigram

Charles Wheatstone

Sir Charles Wheatstone (6 February 1802 – 19 October 1875), was an English scientist and inventor of the Victorian era, his contributions including to the English concertina, the stereoscope (a device for displaying three-dimensional images), and the Playfair cipher (an encryption technique).

See Frequency analysis and Charles Wheatstone

Cicco Simonetta

Francesco (Cicco) Simonetta (1410 – 30 October 1480) was an Italian Renaissance statesman who composed an early treatise on cryptography.

See Frequency analysis and Cicco Simonetta

Ciphertext

In cryptography, ciphertext or cyphertext is the result of encryption performed on plaintext using an algorithm, called a cipher.

See Frequency analysis and Ciphertext

Ciphertext-only attack

In cryptography, a ciphertext-only attack (COA) or known ciphertext attack is an attack model for cryptanalysis where the attacker is assumed to have access only to a set of ciphertexts. Frequency analysis and ciphertext-only attack are cryptographic attacks.

See Frequency analysis and Ciphertext-only attack

Classical cipher

In cryptography, a classical cipher is a type of cipher that was used historically but for the most part, has fallen into disuse.

See Frequency analysis and Classical cipher

Computer

A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations (computation).

See Frequency analysis and Computer

Crossword

A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues.

See Frequency analysis and Crossword

Cryptanalysis

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. Frequency analysis and Cryptanalysis are Arab inventions and cryptographic attacks.

See Frequency analysis and Cryptanalysis

Cryptogram

A cryptogram is a type of puzzle that consists of a short piece of encrypted text.

See Frequency analysis and Cryptogram

Cryptologia

Cryptologia is a journal in cryptography published six times per year since January 1977.

See Frequency analysis and Cryptologia

Edgar Allan Poe

Edgar Allan Poe (January 19, 1809 – October 7, 1849) was an American writer, poet, author, editor, and literary critic who is best known for his poetry and short stories, particularly his tales of mystery and the macabre.

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English language

English is a West Germanic language in the Indo-European language family, whose speakers, called Anglophones, originated in early medieval England on the island of Great Britain.

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Enigma machine

The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication.

See Frequency analysis and Enigma machine

Ernest Vincent Wright

Ernest Vincent Wright (1872October 7, 1939) was an American writer known for his book Gadsby, a 50,000-word novel which, except for the introduction and a note at the end, did not use the letter "e".

See Frequency analysis and Ernest Vincent Wright

Etaoin shrdlu

Etaoin shrdlu is a nonsense phrase that sometimes appeared by accident in print in the days of "hot type" publishing, resulting from a custom of type-casting machine operators filling out and discarding lines of type when an error was made.

See Frequency analysis and Etaoin shrdlu

Gadsby (novel)

Gadsby is a 1939 novel by Ernest Vincent Wright, written without words that contain the letter E, the most common letter in English.

See Frequency analysis and Gadsby (novel)

Georges Perec

Georges Perec (7 March 1936 – 3 March 1982) was a French novelist, filmmaker, documentalist, and essayist.

See Frequency analysis and Georges Perec

IBM

International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American multinational technology company headquartered in Armonk, New York and present in over 175 countries.

See Frequency analysis and IBM

Index of coincidence

In cryptography, coincidence counting is the technique (invented by William F. Friedman) of putting two texts side-by-side and counting the number of times that identical letters appear in the same position in both texts. Frequency analysis and Index of coincidence are cryptographic attacks.

See Frequency analysis and Index of coincidence

Italian language

Italian (italiano,, or lingua italiana) is a Romance language of the Indo-European language family that evolved from the Vulgar Latin of the Roman Empire.

See Frequency analysis and Italian language

Latin

Latin (lingua Latina,, or Latinum) is a classical language belonging to the Italic branch of the Indo-European languages.

See Frequency analysis and Latin

Leon Battista Alberti

Leon Battista Alberti (14 February 1404 – 25 April 1472) was an Italian Renaissance humanist author, artist, architect, poet, priest, linguist, philosopher, and cryptographer; he epitomised the nature of those identified now as polymaths.

See Frequency analysis and Leon Battista Alberti

Letter frequency

Letter frequency is the number of times letters of the alphabet appear on average in written language. Frequency analysis and letter frequency are frequency distribution and Quantitative linguistics.

See Frequency analysis and Letter frequency

Lipogram

A lipogram (from λειπογράμματος, leipográmmatos, "leaving out a letter") is a kind of constrained writing or word game consisting of writing paragraphs or longer works in which a particular letter or group of letters is avoided.

See Frequency analysis and Lipogram

Outline of cryptography

The following outline is provided as an overview of and topical guide to cryptography: Cryptography (or cryptology) – practice and study of hiding information.

See Frequency analysis and Outline of cryptography

Plaintext

In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms.

See Frequency analysis and Plaintext

Playfair cipher

The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher.

See Frequency analysis and Playfair cipher

Polyalphabetic cipher

A polyalphabetic cipher is a substitution, using multiple substitution alphabets.

See Frequency analysis and Polyalphabetic cipher

Polygraphic substitution

Polygraphic substitution is a cipher in which a uniform substitution is performed on blocks of letters.

See Frequency analysis and Polygraphic substitution

Polymath

A polymath (lit; lit) or polyhistor (lit) is an individual whose knowledge spans many different subjects, known to draw on complex bodies of knowledge to solve specific problems.

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Quran

The Quran, also romanized Qur'an or Koran, is the central religious text of Islam, believed by Muslims to be a revelation directly from God (Allah).

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Renaissance

The Renaissance is a period of history and a European cultural movement covering the 15th and 16th centuries.

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Rotor machine

In cryptography, a rotor machine is an electro-mechanical stream cipher device used for encrypting and decrypting messages.

See Frequency analysis and Rotor machine

Sherlock Holmes

Sherlock Holmes is a fictional detective created by British author Arthur Conan Doyle.

See Frequency analysis and Sherlock Holmes

Signal Intelligence Service

The Signal Intelligence Service (SIS) was the United States Army codebreaking division through World War II.

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Software

Software consists of computer programs that instruct the execution of a computer.

See Frequency analysis and Software

Substitution cipher

In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth.

See Frequency analysis and Substitution cipher

The Adventure of the Dancing Men

"The Adventure of the Dancing Men" is a Sherlock Holmes story written by Sir Arthur Conan Doyle as one of 13 stories in the cycle published as The Return of Sherlock Holmes in 1905.

See Frequency analysis and The Adventure of the Dancing Men

The Gold-Bug

"The Gold-Bug" is a short story by American writer Edgar Allan Poe published in 1843.

See Frequency analysis and The Gold-Bug

Trigram

Trigrams are a special case of the ''n''-gram, where n is 3.

See Frequency analysis and Trigram

United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of the continental mainland.

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United States

The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America.

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World War II

World War II or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two alliances: the Allies and the Axis powers.

See Frequency analysis and World War II

Zipf's law

Zipf's law is an empirical law that often holds, approximately, when a list of measured values is sorted in decreasing order. Frequency analysis and Zipf's law are Quantitative linguistics.

See Frequency analysis and Zipf's law

See also

Frequency distribution

Quantitative linguistics

References

[1] https://en.wikipedia.org/wiki/Frequency_analysis

Also known as Etaoi, Frequency analysis (cryptanalysis), Letter frequency analysis.

, United Kingdom, United States, World War II, Zipf's law.