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- Q1124307 subject Q8790336.
- Q1124307 abstract "The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large encryption/decryption matrix used in the four-square cipher while still being slightly stronger than the (single-square) Playfair cipher.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 two-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.".
- Q1124307 wikiPageExternalLink fm-34-40-2.
- Q1124307 wikiPageWikiLink Q141090.
- Q1124307 wikiPageWikiLink Q220871.
- Q1124307 wikiPageWikiLink Q327675.
- Q1124307 wikiPageWikiLink Q565636.
- Q1124307 wikiPageWikiLink Q620009.
- Q1124307 wikiPageWikiLink Q829915.
- Q1124307 wikiPageWikiLink Q8790336.
- Q1124307 wikiPageWikiLink Q897511.
- Q1124307 comment "The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large encryption/decryption matrix used in the four-square cipher while still being slightly stronger than the (single-square) Playfair cipher.The technique encrypts pairs of letters (digraphs), and thus falls into a category of ciphers known as polygraphic substitution ciphers.".
- Q1124307 label "Two-square cipher".