Interactive Explorations

Hands-on applets for Elements of Cryptanalysis

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Part I — Foundations of Cryptanalysis (Chapters 1–3)

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Caesar Cipher Explorer

Encrypt and decrypt messages with shift ciphers. Visualize letter frequency distributions and perform automated cryptanalysis using chi-squared statistics.

Chapters 1–3

Part IV — The Enigma Machine (Chapters 10–12)

Enigma Machine Simulator

Interactive simulation of the Enigma I cipher machine. Configure rotors, ring settings, and plugboard. Watch the signal path animate through the encryption circuit.

Chapter 10

Rejewski's Attack Visualizer

Step through Rejewski's cryptanalysis of the Enigma indicator system. Build characteristic permutations, compute cycle structures, and recover the secret Grundstellung.

Chapter 11
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Rotor Wiring Deduction

See how Rejewski recovered the Enigma's secret rotor wiring using permutation algebra and leaked daily keys. Strip known components and propagate constraints to reconstruct the unknown wiring.

Chapter 11

Zygalski Sheet Simulator

Watch perforated sheets narrow down the Grundstellung one female at a time. Each overlay eliminates impossible rotor positions until only the true setting remains.

Chapter 11b

Welchman-Turing Bombe Simulator

Watch the Bombe search through rotor positions, propagate constraints through menu loops, and recover Enigma settings from a known-plaintext crib.

Chapter 12

Part VI — Linear Cryptanalysis (Chapters 16–18)

S-Box Analysis Tool

Compute and visualize Linear Approximation Tables (LAT) and Difference Distribution Tables (DDT). Edit S-box values interactively and measure cryptographic strength.

Chapters 16–20

Part IX — RSA and Factoring (Chapters 25–27)

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RSA Explorer

Generate RSA key pairs, encrypt and decrypt messages step-by-step. Visualize modular exponentiation and attempt factoring attacks on small keys.

Chapter 25

Part XIV — Lattice-Based Cryptography (Chapters 40–42)

Lattice Explorer

Visualize 2D lattices, drag basis vectors interactively, apply LLL reduction, and explore SVP/CVP problems. See how basis reduction reveals short vectors.

Chapter 40