This is a self-contained, client-side cryptography demonstration playground built with vanilla HTML, CSS, and JavaScript. All execution occurs entirely in your browser with zero backend dependencies, database storage, or external APIs.

Educational Notice: This project is designed for demonstrating cipher mechanics, historical rotor machines, and algorithmic concepts. It should never be used to protect sensitive personal, financial, or confidential data.

• Classic Enigma (WWII 3-Rotor Simulator): Simulates the mechanical WWII Enigma machine with three configurable rotors (I, II, III), a selectable reflector (Standard, Wide, Thin), and an optional plugboard. Rotors mechanically rotate forward as each character is processed. Because Enigma is a reciprocal cipher, running the generated ciphertext through identical rotor settings decodes it back to plaintext.
• RC4 Stream Cipher (Functional Byte-Level Implementation): Implements the classic RC4 stream cipher algorithm. It builds a 256-byte state array (S-box), executes key-scheduling permutation swaps (KSA), generates a pseudo-random keystream (PRGA), and XORs it against character bytes.
• Custom Keyed Shift Cipher: A key-dependent byte-shifting cipher where characters are shifted based on the numerical ASCII sum and positions of the key.
• Simulated AES & Triple DES (Conceptual Demos): Educational mock implementations that illustrate round concepts, salt generation, and iterative key derivation loops via repeated Base64 encoding. These are conceptual simulations for educational illustration and are not compliant with official NIST FIPS AES or 3DES specifications.

• Structure: Semantic HTML5 defining all controls and inputs.
• Styling: Pure vanilla CSS with dark theme custom properties and responsive layout rules.
• Logic: Pure vanilla JavaScript running directly in the browser.
• State Persistence: Recent operation history is preserved locally using the browser's localStorage API.