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puzzlewocky

brain teasers, word games, paradoxes, situation puzzles, and optical illusions

  • Welcome
    • Disclosure
  • Words
    • Word Ladders
    • Word Squares
    • Mirror Image Messages
    • Palindromes
    • Ambigrams
    • Anagrams
    • Antonyms
    • Homonyms
    • Self-Reference
    • Constrained Communication
    • Strange Sentences
    • The Startling Puzzle
    • Alphabetic Sentences
    • Snowball Sentences
    • Garden Path Sentences
    • Funny Back-Formations
  • Philosophy
    • The Ronald Opus Story
    • Absence of Evidence
    • The Grue Problem
    • Paradoxes
      • A Collection of Short Paradoxes
      • Hempel’s Raven Paradox
      • Paradox of the 99 Foot Tall Man
      • Russell’s Barber Paradox
      • Newcomb’s Paradox
      • Simpson’s Paradox
      • The Liar Paradox
      • The False Positive Paradox
      • Hilbert’s Paradox of the Infinite Hotel
      • Coin Flip Paradox
      • Berkson’s Paradox
    • Logical Fallacies
      • The Gambler’s Fallacy
      • The Nicolas Cage Problem
      • The Linda Problem
      • Fallacies of Distraction
      • The Horrible Bosses 2 Fallacy
      • Hot Hand “Fallacy”
    • Cognitive Illusions
      • The Mere Exposure Effect
      • Denominator Neglect
      • The Baader-Meinhof Phenomenon
  • Math
    • Graeco-Latin Squares
    • From Latin Squares to Projective Planes
    • Geometric Magic Squares
    • The Mandelbrot Set
    • Conway’s Game of Life
    • The Dozenal System
    • Benford’s Law
    • Venn Diagrams
  • Parlor Games
    • 4×4 Face Card Puzzle
    • Metaphorical Courtroom
    • The Ranking Game
    • What’s Wrong with this Picture?
    • Meeting in the Middle
    • Vatican Noun
    • The Simile Game
    • Creative Analogies
    • The Dictionary Game
    • Abstract Twenty Questions
    • String Handcuffs Puzzle
    • Rock Paper Scissors Lizard Spock
  • Brain Teasers
    • Situation Puzzles
    • Classic Short Brain Teasers and Riddles
    • Logic Puzzles
      • Einstein’s Puzzle
      • The Wason Selection Task
      • Knights and Knaves
      • Hardest Logic Puzzle Ever
      • Prisoners and the Switch
      • Hat Puzzles
      • The Secret Word
    • Probability Puzzles
      • The Monty Hall Problem
      • Two Envelopes Problem
      • Boys and Girls Problems
      • The Three Card Puzzle
      • The Two Dice Wager
      • Drawing a Diamond
      • The Birthday Problem
      • Each Shuffle Is Unique
    • Math Puzzles
      • The Pirate Puzzle
      • Cheryl’s Birthday
      • Profit Percentage Puzzler
    • Cryptography
      • Secrets and Padlocks Problem
    • Game Theory
      • Truel
    • Unsolvable Puzzles
      • Seven Bridges of Königsberg Puzzle
      • Checkerboard and Dominoes
      • The 36 Officers Puzzle
    • Odd One Out Puzzle
    • Married-Unmarried Puzzle
    • Three Light Switches
    • Mirror Problems
    • Randomness and Patterns
  • Illusions
    • Color Illusions
      • Banana Optical Illusion
      • Lettuce Optical Illusion
      • Blue Eyes Optical Illusion
      • Chicken Coop Optical Illusion
      • Seahorse Color Illusion
      • The Dress
      • Which Green is Different?
      • Red and Green Make Yellow
    • 3D Illusions
      • Chromostereopsis
      • Stereograms
      • Cross-View Stereograms
    • Kanizsa Illusions
    • Checker Shadow Illusion
  • Games
    • Dice of Sundry Sides
    • Why Name That! Is So Great
    • Finite Projective Planes and the Math of Spot It!
    • Non-Transitive Dice
  • Books

Cryptography

Secret Messages and Padlocks

Secret

Creative Commons License
Copyright 2015-2026 by Brendan Conley. Not-for-profit reposts OK with link/credit.
  • Welcome
    • Disclosure
  • Words
    • Word Ladders
    • Word Squares
    • Mirror Image Messages
    • Palindromes
    • Ambigrams
    • Anagrams
    • Antonyms
    • Homonyms
    • Self-Reference
    • Constrained Communication
    • Strange Sentences
    • The Startling Puzzle
    • Alphabetic Sentences
    • Snowball Sentences
    • Garden Path Sentences
    • Funny Back-Formations
  • Philosophy
    • The Ronald Opus Story
    • Absence of Evidence
    • The Grue Problem
    • Paradoxes
      • A Collection of Short Paradoxes
      • Hempel’s Raven Paradox
      • Paradox of the 99 Foot Tall Man
      • Russell’s Barber Paradox
      • Newcomb’s Paradox
      • Simpson’s Paradox
      • The Liar Paradox
      • The False Positive Paradox
      • Hilbert’s Paradox of the Infinite Hotel
      • Coin Flip Paradox
      • Berkson’s Paradox
    • Logical Fallacies
      • The Gambler’s Fallacy
      • The Nicolas Cage Problem
      • The Linda Problem
      • Fallacies of Distraction
      • The Horrible Bosses 2 Fallacy
      • Hot Hand “Fallacy”
    • Cognitive Illusions
      • The Mere Exposure Effect
      • Denominator Neglect
      • The Baader-Meinhof Phenomenon
  • Math
    • Graeco-Latin Squares
    • From Latin Squares to Projective Planes
    • Geometric Magic Squares
    • The Mandelbrot Set
    • Conway’s Game of Life
    • The Dozenal System
    • Benford’s Law
    • Venn Diagrams
  • Parlor Games
    • 4×4 Face Card Puzzle
    • Metaphorical Courtroom
    • The Ranking Game
    • What’s Wrong with this Picture?
    • Meeting in the Middle
    • Vatican Noun
    • The Simile Game
    • Creative Analogies
    • The Dictionary Game
    • Abstract Twenty Questions
    • String Handcuffs Puzzle
    • Rock Paper Scissors Lizard Spock
  • Brain Teasers
    • Situation Puzzles
    • Classic Short Brain Teasers and Riddles
    • Logic Puzzles
      • Einstein’s Puzzle
      • The Wason Selection Task
      • Knights and Knaves
      • Hardest Logic Puzzle Ever
      • Prisoners and the Switch
      • Hat Puzzles
      • The Secret Word
    • Probability Puzzles
      • The Monty Hall Problem
      • Two Envelopes Problem
      • Boys and Girls Problems
      • The Three Card Puzzle
      • The Two Dice Wager
      • Drawing a Diamond
      • The Birthday Problem
      • Each Shuffle Is Unique
    • Math Puzzles
      • The Pirate Puzzle
      • Cheryl’s Birthday
      • Profit Percentage Puzzler
    • Cryptography
      • Secrets and Padlocks Problem
    • Game Theory
      • Truel
    • Unsolvable Puzzles
      • Seven Bridges of Königsberg Puzzle
      • Checkerboard and Dominoes
      • The 36 Officers Puzzle
    • Odd One Out Puzzle
    • Married-Unmarried Puzzle
    • Three Light Switches
    • Mirror Problems
    • Randomness and Patterns
  • Illusions
    • Color Illusions
      • Banana Optical Illusion
      • Lettuce Optical Illusion
      • Blue Eyes Optical Illusion
      • Chicken Coop Optical Illusion
      • Seahorse Color Illusion
      • The Dress
      • Which Green is Different?
      • Red and Green Make Yellow
    • 3D Illusions
      • Chromostereopsis
      • Stereograms
      • Cross-View Stereograms
    • Kanizsa Illusions
    • Checker Shadow Illusion
  • Games
    • Dice of Sundry Sides
    • Why Name That! Is So Great
    • Finite Projective Planes and the Math of Spot It!
    • Non-Transitive Dice
  • Books
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