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gptkbp:instance_of
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gptkb:blockade
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gptkbp:alphabet
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English alphabet without J
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gptkbp:character_pairing
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pairs of letters
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gptkbp:characters
|
Latin alphabet
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gptkbp:cipher_strength
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depends on key secrecy
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gptkbp:cryptanalysis
|
frequency analysis
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gptkbp:decryption_example
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HHEO -> HELLO
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gptkbp:decryption_process
|
reverse of encryption process
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gptkbp:decryption_steps
|
reverse encryption steps
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gptkbp:difficulty
|
O(n) for encryption
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gptkbp:educational_use
|
teaching cryptography
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gptkbp:encryption_example
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HELLO -> HEO LLO -> HEOX LLOX
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gptkbp:encryption_steps
|
form digraphs, locate in grid, substitute
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gptkbp:handling_duplicates
|
replace with X
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gptkbp:handling_odd_length
|
add X at the end
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gptkbp:has_limitations
|
vulnerable to known-plaintext attacks
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gptkbp:historical_context
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developed during Victorian era
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gptkbp:historical_significance
|
rarely used today
first digraph substitution cipher
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|
https://www.w3.org/2000/01/rdf-schema#label
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Playfair cipher
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gptkbp:influenced_by
|
simple substitution ciphers
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gptkbp:input_output
|
ciphertext
plaintext
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gptkbp:invention
|
gptkb:Charles_Wheatstone
1854
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gptkbp:is_popular_in
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military communications
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gptkbp:is_similar_to
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gptkb:Vigenère_cipher
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gptkbp:key
|
5x5 grid of letters
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gptkbp:key_feature
|
key must be kept secret
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gptkbp:key_grid
|
constructed from key phrase
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gptkbp:notable_for
|
gptkb:World_War_I
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gptkbp:pairing
|
same row or column substitution
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gptkbp:previous_name
|
Playfair code
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gptkbp:related_to
|
transposition cipher
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gptkbp:requires
|
key phrase
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gptkbp:requires_key
|
key phrase length must be 25
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gptkbp:security
|
moderate
substitution cipher
digraph substitution
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gptkbp:used_by
|
British military
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gptkbp:used_for
|
encrypting digraphs
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gptkbp:variant
|
Playfair cipher with numbers
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gptkbp:bfsParent
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gptkb:Classical_Cryptography
gptkb:John_Playfair
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gptkbp:bfsLayer
|
5
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