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Plaintext‐Autokey (PTAK)
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Lymm edited this page
Nov 13, 2025
·
1 revision
TBD
(The eyes are not this, though)
Wiki pages
Pages
55
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Home
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Affine General Linear Group (AGL)
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Alberti Cipher
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Allomorphs
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Alphabet Chaining
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Chaining Conflict Rates
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Chaining Conflicts
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Ciphertext‐Autokey (CTAK)
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Cyclic Group
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Data
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Deck Cipher
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Dihedral Group
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Explanation of Progress
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Extended Group Autokey (XGAK)
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Frequency Analysis
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Generation
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Graph Chaining
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Group Autokey (GAK)
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Group Ciphertext‐Autokey (GCTAK)
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Groups
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Hidden State
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Homophonic Substitution Cipher
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Isomorphic Cipher Hierarchy
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Isomorphs (Gap Patterns)
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Message Features
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Message Starts
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No Doubles
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Perfect Isomorphism
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Permutations
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Plaintext‐Autokey (PTAK)
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Progressive Cipher
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Proof of the condition for hidden subgroup irreducibility in GAK
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Proof that GAK can prevent doubles
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Proof that GAK has perfect isomorphism
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Proof that GAK is transitive
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Proof that GAK is uniquely reversible
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Proof that non‐associativity breaks perfect isomorphism
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Proof that semidirect product GAK has a left action on CT symbols when the hidden state is fixed
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Proof that the eyes cannot be a dihedral GAK cipher
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Reading Orders
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Repeating Key
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Shared Sections
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Simple Substitution Cipher
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Smallest GAK Examples with Particular Small Hidden Subgroups
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Substitution Cipher
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Symmetric Group (All Permutations)
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The Caboose
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The Funny‐looking Obstacle
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The Stutter Section
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The Transitivity Restriction (6 Groups for 83)
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Timeline
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Transposition Cipher
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Trigrams
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Vigenere Cipher
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Wadsworth Cipher
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