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searching for Polygraphic substitution 3 found (12 total)

alternate case: polygraphic substitution

Four-square cipher (1,528 words) [view diff] exact match in snippet view article find links to article

(digraphs), and thus falls into a category of ciphers known as polygraphic substitution ciphers. This adds significant strength to the encryption when

Félix Delastelle (303 words) [view diff] exact match in snippet view article find links to article

of considerable importance in cryptology." Delastelle's other polygraphic substitution ciphers included the trifid and four-square ciphers. The last of

Substitution cipher (3,985 words) [view diff] exact match in snippet view article find links to article

making the keystream as long and unpredictable as possible. In a polygraphic substitution cipher, plaintext letters are substituted in larger groups, instead