|
gptkbp:instanceOf
|
gptkb:algorithm
crypt
|
|
gptkbp:alphabet
|
25 letters (I/J combined)
|
|
gptkbp:category
|
crypt
|
|
gptkbp:cipherType
|
digraph substitution cipher
|
|
gptkbp:citation
|
https://en.wikipedia.org/wiki/Playfair_cipher
|
|
gptkbp:decryptionRule
|
reverse encryption rules
|
|
gptkbp:difficulty
|
harder to break than simple substitution
|
|
gptkbp:encryptionRule
|
rectangle: replace with letters on same row
same column: replace with letter below
same row: replace with letter to right
|
|
gptkbp:historicalSignificance
|
widely used before computers
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Playfair cipher
|
|
gptkbp:introducedIn
|
1854
|
|
gptkbp:inventedBy
|
gptkb:Charles_Wheatstone
|
|
gptkbp:key
|
keyword
|
|
gptkbp:limitation
|
does not protect against modern cryptanalysis
|
|
gptkbp:namedAfter
|
gptkb:Lyon_Playfair
|
|
gptkbp:notableFeature
|
encrypts digraphs instead of single letters
first practical digraph substitution cipher
|
|
gptkbp:plaintextUnit
|
pair of letters
|
|
gptkbp:popularizedBy
|
gptkb:Lyon_Playfair
|
|
gptkbp:relatedTo
|
gptkb:Vigenère_cipher
gptkb:Four-square_cipher
gptkb:Hill_cipher
|
|
gptkbp:supportsAlgorithm
|
manual symmetric encryption
|
|
gptkbp:usedBy
|
gptkb:British_Army
|
|
gptkbp:usedDuring
|
gptkb:World_War_I
gptkb:World_War_II
gptkb:Second_Boer_War
|
|
gptkbp:usedIn
|
military communications
|
|
gptkbp:uses
|
5x5 matrix of letters
|
|
gptkbp:vulnerableTo
|
frequency analysis
known plaintext attack
|
|
gptkbp:bfsParent
|
gptkb:Codebusters
|
|
gptkbp:bfsLayer
|
5
|