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Although the Baron Playfair’s name is attached to one of the better-known classical ciphers, the baron’s friend, scientist Charles Wheatstone, actually devised the Playfair cipher.
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trumpetpower.com/Papers/Crypto/Playfair
trumpetpower.com/Papers/Crypto/Playfair
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The Playfair Cipher was popularised by Lyon Playfair, but it was invented by Charles Wheatstone, one of the pioneers of the telegraph. The cipher replaces each pair of letters in the plaintext with another pair of letters, so it is a type of digraph cipher.As an example, let's encrypt the message 'Meet me at...
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www.simonsingh.net/The_Black_Chamber/playfaircipher.htm
www.simonsingh.net/The_Black_Chamber/playfaircipher.htm
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The Playfair cipher is a digraph substitution cipher. It employs a table where one letter of the alphabet is omitted, and the letters are arranged in a 5x5 grid. Typically, the J is removed from the alphabet and an I takes its place in the text that is to be encoded.
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rumkin.com/tools/cipher/playfair.php
rumkin.com/tools/cipher/playfair.php
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The Playfair cipher encrypts pairs of letters (digraphs), instead of single letters. This is significantly harder to break since the frequency analysis used for simple substitution ciphers is considerably more difficult.
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www.braingle.com/brainteasers/codes/playfair.php
www.braingle.com/brainteasers/codes/playfair.php
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Enter a keyword and either the plaintext or the ciphertext. Clicking either "encrypt" or "decrypt" will fill in the square used in the cipher, and will display the associated ciphertext (encrypt) or plaintext (decrypt).
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cs.colgate.edu/faculty/nevison/Core139Web/tools/playfai...
cs.colgate.edu/faculty/nevison/Core139Web/tools/playfair.html
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; Back to Crack the Ciphers; In 1854, Sir Charles Wheatstone invented the cipher known as "Playfair," named for his friend Lyon Playfair, first Baron Playfair of St. Andrews, who popularized and promoted the cipher.
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www.pbs.org/wgbh/nova/decoding/playfair.html
www.pbs.org/wgbh/nova/decoding/playfair.html
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In 1854, Sir Charles Wheatstone invented the cipher known as "Playfair," named for his friend Lyon Playfair, first Baron Playfair of St. Andrews, who popularized and promoted the cipher.
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www.math.temple.edu/~renault/cryptology/playfair.html
www.math.temple.edu/~renault/cryptology/playfair.html
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The Playfair Cipher, its history and use in crosswords ... Playfair Cipher Utility ... Playfair Cipher uses a 5 by 5 square, in which the letters of an agreed key word or phrase are entered (suppressing duplicates), followed by the rest of the alphabet in order. I and J would usually be combined together.
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www.crosswordman.com/cgi-bin/playfair
www.crosswordman.com/cgi-bin/playfair
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The Playfair Cipher is a simple transposition cipher offering a relatively weak method of encryption. ... The playfair cipher was created by Sir Charles Wheatstone (known for the Wheatstone bridge). Wheatstone and Baron Playfair of St. Andrew's both had cryptography as a serious hobby.
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everything2.com/title/Playfair+Cipher
everything2.com/title/Playfair+Cipher
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