Playfairn.

Brit.

/ˈpleɪfɛː/, U.S.

/ˈpleɪˌfɛ(ə)r/

Origin: From a proper name. Etymon: proper name Playfair.

Etymology: < the name of Lyon Playfair, 1st Lord Playfair (1818–98), British chemist and politician, who championed within the Foreign Office the cipher developed by Charles Wheatstone (1802–75; compare Wheatstone n.).

Cryptography.

I. Compounds.

1. attributive. Designating a cipher in which successive pairs of letters are replaced by pairs chosen in a prescribed manner from a matrix of 25 letters, usually arranged in accordance with a keyword.

ΘΚΠ

the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > particular codes

character1605

needle-alphabet1663

unicode1886

rail fence1916

Vigenère1916

Playfair1918

Playfair1932

one-time system1955

speech code1973

one-time cipher1977

1918 Amer. Math. Monthly 25 301 Under this type the most interesting point was the construction of a military message by the method of the famous Playfair Cipher of the British army.

1966 M. R. D. Foot SOE in France iv. 105 As simple as a Playfair code based on a single word.

1974 Encycl. Brit. Micropædia X. 643/3 He [sc. Sir Charles Wheatstone]..invented the Playfair cipher, which is based on substituting different pairs of letters for paired letters in the message.

1993 N. Currer-Briggs in F. H. Hinsley & A. Stripp Codebreakers xxiii. 209 Between 1900 and 1914 the British adopted the Playfair cipher, which in its original form was based on a keyword in the first position of a 5 x 5 letter square containing the alphabet omitting ‘J’, for which ‘I’ was always substituted.

II. Simple uses.

2. The Playfair cipher; encryption using this.

ΘΚΠ

the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > particular codes

character1605

needle-alphabet1663

unicode1886

rail fence1916

Vigenère1916

Playfair1918

Playfair1932

one-time system1955

speech code1973

one-time cipher1977

1932 D. L. Sayers Have his Carcase xxvi. 344 Here's a cipher message. Probably Playfair.

1979 Listener 18 Jan. 131/1 I see that I have to encipher my answers to other [crossword] clues in Playfair without knowing the keyword... I have a friend who could solve two Playfair squares before breakfast.

1993 N. Currer-Briggs in F. H. Hinsley & A. Stripp Codebreakers xxiii. 211 By the middle of 1915 the Germans had completely broken down British Playfair.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	playfair
释义	Playfairn. Brit. /ˈpleɪfɛː/, U.S. /ˈpleɪˌfɛ(ə)r/ Origin: From a proper name. Etymon: proper name Playfair. Etymology: < the name of Lyon Playfair, 1st Lord Playfair (1818–98), British chemist and politician, who championed within the Foreign Office the cipher developed by Charles Wheatstone (1802–75; compare Wheatstone n.). Cryptography. I. Compounds. 1. attributive. Designating a cipher in which successive pairs of letters are replaced by pairs chosen in a prescribed manner from a matrix of 25 letters, usually arranged in accordance with a keyword. ΘΚΠ the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > particular codes character1605 needle-alphabet1663 unicode1886 rail fence1916 Vigenère1916 Playfair1918 Playfair1932 one-time system1955 speech code1973 one-time cipher1977 1918 Amer. Math. Monthly 25 301 Under this type the most interesting point was the construction of a military message by the method of the famous Playfair Cipher of the British army. 1966 M. R. D. Foot SOE in France iv. 105 As simple as a Playfair code based on a single word. 1974 Encycl. Brit. Micropædia X. 643/3 He [sc. Sir Charles Wheatstone]..invented the Playfair cipher, which is based on substituting different pairs of letters for paired letters in the message. 1993 N. Currer-Briggs in F. H. Hinsley & A. Stripp Codebreakers xxiii. 209 Between 1900 and 1914 the British adopted the Playfair cipher, which in its original form was based on a keyword in the first position of a 5 x 5 letter square containing the alphabet omitting ‘J’, for which ‘I’ was always substituted. II. Simple uses. 2. The Playfair cipher; encryption using this. ΘΚΠ the mind > mental capacity > knowledge > secrecy, concealment > code, cipher > [noun] > particular codes character1605 needle-alphabet1663 unicode1886 rail fence1916 Vigenère1916 Playfair1918 Playfair1932 one-time system1955 speech code1973 one-time cipher1977 1932 D. L. Sayers Have his Carcase xxvi. 344 Here's a cipher message. Probably Playfair. 1979 Listener 18 Jan. 131/1 I see that I have to encipher my answers to other [crossword] clues in Playfair without knowing the keyword... I have a friend who could solve two Playfair squares before breakfast. 1993 N. Currer-Briggs in F. H. Hinsley & A. Stripp Codebreakers xxiii. 211 By the middle of 1915 the Germans had completely broken down British Playfair. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1918
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