Add cipher consistency, validation feedback, and solution reveal to frequency analysis tool

[Copilot]

Sample encrypted texts were inconsistently encrypted, making them unsolvable. The tool lacked feedback mechanisms to guide users through the decryption process.

Changes

Cipher System

• Implemented consistent substitution cipher (QWERTYUIOPASDFGHJKLZXCVBNM)
• Regenerated all language samples (EN, ES, FR, DE) with encryptText()
• Created solutionMappings object for validation

Real-time Validation

• Added validateSubstitutions() to compare user input against correct mappings
• Visual feedback: green border for correct, red for incorrect substitutions
• Progress indicator displays "Correct: X/Y Accuracy: Z%"
• Only active when sample text is loaded

Show Solution Feature

• Button in header, disabled for custom input
• Confirmation dialog before revealing complete solution
• Auto-fills all correct mappings on confirmation

UI

Validation feedback with progress tracking:

Solution revealed (22/22 correct):

Implementation

// Consistent cipher mapping
const PLAIN_ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
const CIPHER_ALPHABET = 'QWERTYUIOPASDFGHJKLZXCVBNM';

// Validation tracks sample state
let isSampleLoaded = false;

function validateSubstitutions() {
    if (!isSampleLoaded) return null;
    
    const encryptedText = inputText.value.toUpperCase().replace(/[^A-Z]/g, '');
    const uniqueLetters = [...new Set(encryptedText)];
    
    uniqueLetters.forEach(encryptedChar => {
        const userSub = substitutions[encryptedChar];
        const correctSub = solutionMappings[encryptedChar];
        // Compare and return validation results
    });
}

Files modified: main.js (+204 lines), index.html (+4 lines), style.css (+28 lines)

Original prompt

Problem

The frequency analysis simulation has issues with the sample encrypted texts and lacks features to help users validate their work. Based on the decoded output shown in , the substitution mappings are producing incorrect results.

Required Changes

1. Fix Sample Text Encryption Logic

The sample texts in main.js (lines 33-38) need to be properly encrypted with a consistent, verifiable cipher. Currently, when users try to decode the samples, they get inconsistent results.

Requirements:

• Create a proper cipher function that uses a consistent substitution alphabet
• Regenerate all sample encrypted texts (English, Spanish, French, German) using this cipher
• Store the correct decryption mappings for each sample so they can be verified
• Use a Caesar-like shift or a fixed substitution alphabet that is consistent across all samples

Suggested cipher alphabet for consistency:

Plain:  ABCDEFGHIJKLMNOPQRSTUVWXYZ
Cipher: QWERTYUIOPASDFGHJKLZXCVBNM

Or use a consistent Caesar shift (e.g., +3).

2. Add Validation and Hints

Add visual feedback to help users know when they're on the right track:

Requirements:

• When a user enters a substitution mapping, validate it against the known correct mapping for sample texts
• Add visual indicators (e.g., green highlight for correct mappings, red for incorrect)
• Add a hint system that shows how many letters are correctly mapped (e.g., "5/26 letters correct")
• Add a progress indicator in the decoded view showing accuracy percentage
• Only validate when using sample texts (not custom encrypted input)

UI Changes needed:

• Add a status message below the substitution grid showing validation feedback
• Color-code the substitution input boxes: green border for correct, red for incorrect (only for samples)
• Add a small counter showing "Correct: X/Y" where Y is the number of unique letters in the encrypted sample

3. Add "Show Solution" Button

Add a button that reveals the correct substitution mappings for educational purposes:

Requirements:

• Add a "Show Solution" button next to the existing control buttons
• When clicked, automatically fill in all correct substitution mappings for the current sample
• Only enable this button when a sample text is loaded (disable for custom input)
• Add a confirmation dialog: "Are you sure? This will reveal the complete solution."
• After showing solution, maybe add a visual indication that solution was revealed

Button placement:
Add it in the header controls section next to "Reset All" button in index.html

4. Technical Implementation Notes

In main.js:

• Create a solutionMappings object that stores the correct decryption key for each language sample
• Create a validateSubstitutions() function that compares current substitutions against the solution
• Create a showSolution() function that fills in all correct mappings
• Update updateDecodedDisplay() to show validation feedback
• Add a flag isSampleLoaded to track if a sample is currently loaded

In index.html:

• Add the new button and validation UI elements

In style.css:

• Add styles for validation feedback (green/red borders, success/error messages)
• Style the new "Show Solution" button
• Add styles for the progress indicator

Example Output

After fixes, users should be able to:

1. Load a sample and see it properly encrypted
2. Enter substitutions and see immediate feedback (green for correct, red for incorrect)
3. See their progress (e.g., "12/26 letters correct - 85% accuracy")
4. Click "Show Solution" to reveal the complete mapping for learning

Files to Modify

• main.js - Main logic changes
• index.html - Add new UI elements
• style.css - Add validation styling

This pull request was created from Copilot chat.

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