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| # Overview | ||
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| The game is split into three parts. | ||
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| - the core logic of the game (implemented in rust) | ||
| - the frontend (implemented in flask) | ||
| - the RL agent (implemented in python / jax) | ||
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| ## Core logic | ||
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| Why did I implement the core logic in rust? | ||
| Good question. | ||
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| I knew I wanted to do some reinforcement learning, so I wanted the core logic to be fast. | ||
| I also wanted to learn rust. | ||
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| I have implemented the core game in rust with some small changes; | ||
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| - encryption is based on a 'simple' version of enimga. Aka, a 2 rotor polynumeric substitution cipher. | ||
| - re-encryption now costs victory points | ||
| - you can send as many or as few resources to a single battle as you like (rather than max 2). | ||
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| ## Frontend | ||
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| ## RL agent | ||
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| I have implemented a RL agent to play the game. |
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| --- | ||
| title: A tutorial on ciphers and enigma | ||
| subtitle: "Code breaking" | ||
| layout: post | ||
| permalink: /turing-vs-scherbius/enigma/ | ||
| categories: | ||
| - "tutorial" | ||
| --- | ||
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| <style> | ||
| .small-input { | ||
| width: 50px; | ||
| } | ||
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| .large-input { | ||
| width: 240px; | ||
| font-size: 16px; | ||
| } | ||
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| p { | ||
| font-size: 16px; | ||
| } | ||
| </style> | ||
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| <!-- link to my easy enigma --> | ||
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| ## Cesar Cipher | ||
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| Enter a string to see it shifted by <input type="number" id="inputK" value="3" placeholder=3 class="small-input"> positions: | ||
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| <div> | ||
| <input type="text" id="inputTextCesar" placeholder="Enter text here" onkeypress="checkEnterCesar(event)"> | ||
| </div> | ||
| <p>Shifted Text: <span id="shiftedText"></span></p> | ||
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| <script> | ||
| function checkEnterCesar(event) { | ||
| if (event.key === 'Enter') { | ||
| const input = document.getElementById('inputTextCesar').value; | ||
| const shift = parseInt(document.getElementById('inputK').value); | ||
| let shiftedText = shiftCipher(input, shift); | ||
| document.getElementById('shiftedText').innerText = shiftedText; | ||
| } | ||
| } | ||
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| function shiftCipher(input, shift) { | ||
| // assume only lower case | ||
| const alphabet = 'abcdefghijklmnopqrstuvwxyz'; | ||
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| let shiftedText = ''; | ||
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| for (let i = 0; i < input.length; i++) { | ||
| const char = input[i]; | ||
| const index = alphabet.indexOf(char); | ||
| if (index === -1) { | ||
| shiftedText += char; | ||
| continue; | ||
| } else { | ||
| const newIndex = (index + shift) % 26; | ||
| shiftedText += alphabet[newIndex]; | ||
| } | ||
| } | ||
| return shiftedText; | ||
| } | ||
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| </script> | ||
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| ## Substitution cipher | ||
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| An arbitrary permutation of the alphabet. | ||
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| <div> | ||
| abcdefghijklmnopqrstuvwxyz<br> | ||
| <input type="text" id="inputSubstitution" placeholder="trialbcdefghjkmnopqrsuvwxyz" value="trialbcdefghjkmnopqrsuvwxyz" class="large-input"> | ||
| </div> | ||
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| <div> | ||
| <input type="text" id="inputTextSubstitution" placeholder="Enter text here" onkeypress="checkEnterSubstitution(event)"> | ||
| </div> | ||
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| <p>Substituted Text: <span | ||
| id="substitutedText"></span></p> | ||
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| <script> | ||
| function checkEnterSubstitution(event) { | ||
| if (event.key === 'Enter') { | ||
| const input = document.getElementById('inputTextSubstitution').value; | ||
| const substitution = document.getElementById('inputSubstitution').value; | ||
| let result = substitutionCipher(input, substitution); | ||
| document.getElementById('substitutedText').innerText = result; | ||
| } | ||
| } | ||
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| function substitutionCipher(input, substitution) { | ||
| // assume only lower case | ||
| const alphabet = 'abcdefghijklmnopqrstuvwxyz'; | ||
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| // if first letter of substitution is 't', then 'a' is replaced with 't' | ||
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| let result = ''; | ||
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| for (let i = 0; i < input.length; i++) { | ||
| const char = input[i]; | ||
| const index = substitution.indexOf(char); | ||
| if (index === -1) { | ||
| result += char; | ||
| continue; | ||
| } else { | ||
| result += alphabet[index]; | ||
| } | ||
| } | ||
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| return result; | ||
| } | ||
| </script> | ||
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| ### A stepping substitution cipher | ||
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| This is a simple substitution cipher where the substitution changes every time a letter is used. | ||
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| <div> | ||
| <input type="text" id="inputSteppingSubstitution" placeholder="trialbcdefghjkmnopqrsuvwxyz" value="trialbcdefghjkmnopqrsuvwxyz" class="large-input"> | ||
| <p>Stepper:<span id="counter"></span></p> | ||
| </div> | ||
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| <div> | ||
| <input type="text" id="inputTextStepping" placeholder="Enter text here" onkeypress="checkEnterStepping(event)"> | ||
| </div> | ||
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| <p>Stepping Substituted Text: <span id="steppingSubstitutedText"></span></p> | ||
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| <script> | ||
| let counter = 0; | ||
| document.getElementById('counter').innerText = counter; | ||
| function checkEnterStepping(event) { | ||
| if (event.key === 'Enter') { | ||
| counter += 1; | ||
| document.getElementById('counter').innerText = counter; | ||
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| const input = document.getElementById('inputTextStepping').value; | ||
| const substitution = document.getElementById('inputSteppingSubstitution').value; | ||
| let result = substitutionCipher(input, substitution); | ||
| document.getElementById('steppingSubstitutedText').innerText = result; | ||
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| // update the substitution by shifting it by one | ||
| let updated_sub = shiftCipher(substitution, 1); | ||
| document.getElementById('inputSteppingSubstitution').value = updated_sub; | ||
| } | ||
| } | ||
| </script> |
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