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- Four-square_cipher abstract "The four-square cipher is a manual symmetric encryption technique. It was invented by the famous French cryptographer Felix Delastelle.The technique encrypts pairs of letters (digraphs), and thus falls into a category of ciphers known as polygraphic substitution ciphers. This adds significant strength to the encryption when compared with monographic substitution ciphers which operate on single characters. The use of digraphs makes the four-square technique less susceptible to frequency analysis attacks, as the analysis must be done on 676 possible digraphs rather than just 26 for monographic substitution. The frequency analysis of digraphs is possible, but considerably more difficult - and it generally requires a much larger ciphertext in order to be useful.".
- Four-square_cipher wikiPageExternalLink fm-34-40-2.
- Four-square_cipher wikiPageID "1502284".
- Four-square_cipher wikiPageRevisionID "565762600".
- Four-square_cipher hasPhotoCollection Four-square_cipher.
- Four-square_cipher subject Category:Classical_ciphers.
- Four-square_cipher type Abstraction100002137.
- Four-square_cipher type Cipher106254239.
- Four-square_cipher type ClassicalCiphers.
- Four-square_cipher type Communication100033020.
- Four-square_cipher type Message106253690.
- Four-square_cipher comment "The four-square cipher is a manual symmetric encryption technique. It was invented by the famous French cryptographer Felix Delastelle.The technique encrypts pairs of letters (digraphs), and thus falls into a category of ciphers known as polygraphic substitution ciphers. This adds significant strength to the encryption when compared with monographic substitution ciphers which operate on single characters.".
- Four-square_cipher label "Four-square cipher".
- Four-square_cipher label "四方密碼".
- Four-square_cipher sameAs m.056cln.
- Four-square_cipher sameAs Q220871.
- Four-square_cipher sameAs Q220871.
- Four-square_cipher sameAs Four-square_cipher.
- Four-square_cipher wasDerivedFrom Four-square_cipher?oldid=565762600.
- Four-square_cipher isPrimaryTopicOf Four-square_cipher.