Cipher-Auto-Decoder/Cipher-Auto-Decoder2.html at main · 737simpilot/Cipher-Auto-Decoder · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Caesar Cipher Auto-Decoder</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            padding: 40px;
        }

        h1 {
            color: #333;
            margin-bottom: 10px;
            text-align: center;
        }

        .subtitle {
            text-align: center;
            color: #668;
            margin-bottom: 30px;
        }

        .upload-section {
            background: #f8f9fa;
            border: 2px dashed #667eea;
            border-radius: 10px;
            padding: 30px;
            text-align: center;
            margin-bottom: 30px;
            transition: all 0.3s;
        }

        .upload-section:hover {
            border-color: #764ba2;
            background: #f0f1ff;
        }

        .file-input-wrapper {
            position: relative;
            display: inline-block;
        }

        input[type="file"] {
            display: none;
        }

        .file-button {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 12px 30px;
            border-radius: 25px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            display: inline-block;
            transition: transform 0.2s;
        }

        .file-button:hover {
            transform: scale(1.05);
        }

        .file-status {
            margin-top: 15px;
            color: #28a745;
            font-weight: 600;
        }

        .input-section {
            margin-bottom: 30px;
        }

        label {
            display: block;
            margin-bottom: 10px;
            color: #333;
            font-weight: 600;
        }

        select {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            background: white;
            cursor: pointer;
            transition: border-color 0.3s;
        }

        select:focus {
            outline: none;
            border-color: #667eea;
        }

        textarea {
            width: 100%;
            padding: 15px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            font-family: 'Courier New', monospace;
            resize: vertical;
            transition: border-color 0.3s;
        }

        textarea:focus {
            outline: none;
            border-color: #667eea;
        }

        button {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 15px 40px;
            font-size: 18px;
            font-weight: 600;
            border-radius: 25px;
            cursor: pointer;
            width: 100%;
            transition: transform 0.2s;
        }

        button:hover {
            transform: translateY(-2px);
        }

        button:disabled {
            background: #ccc;
            cursor: not-allowed;
            transform: none;
        }

        .results {
            margin-top: 30px;
        }

        .best-result {
            background: linear-gradient(135deg, #d4fc79 0%, #96e6a1 100%);
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 25px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .best-result h2 {
            color: #2d5016;
            margin-bottom: 15px;
        }

        .result-text {
            background: white;
            padding: 20px;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            font-size: 16px;
            line-height: 1.6;
            word-wrap: break-word;
        }

        .shift-info {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .all-results {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
        }

        .all-results h3 {
            color: #333;
            margin-bottom: 20px;
        }

        .result-item {
            background: white;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 15px;
            border-left: 4px solid #667eea;
        }

        .result-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            font-weight: 600;
            color: #667eea;
        }

        .result-preview {
            font-family: 'Courier New', monospace;
            color: #668;
            font-size: 14px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .error {
            background: #f8d7da;
            color: #721c24;
            padding: 15px;
            border-radius: 8px;
            margin-top: 20px;
            border: 1px solid #f5c6cb;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>🔓 Cipher Auto-Decoder</h1>
        <p class="subtitle">Upload your dictionary and automatically decrypt Caesar or ROT47 ciphers</p>

        <div class="upload-section">
            <div class="file-input-wrapper">
                <label for="dictFile" class="file-button">Choose Dictionary File</label>
                <input type="file" id="dictFile" accept=".txt,.dic,.text,text/plain">
            </div>
            <div class="file-status" id="fileStatus"></div>
            <p style="color: #668; margin-top: 10px; font-size: 14px;">
                Upload a text file with one word per line
            </p>
        </div>

        <div class="input-section">
            <label for="cipherType">Cipher Type:</label>
            <select id="cipherType">
                <option value="caesar">Caesar Cipher (26 shifts - letters only)</option>
                <option value="rot47">ROT47 (94 shifts - all printable characters)</option>
                <option value="combined">Combined (Caesar then ROT47, or ROT47 then Caesar)</option>
            </select>
        </div>

        <div class="input-section">
            <label for="encryptedText">Encrypted Message:</label>
            <textarea id="encryptedText" rows="6" placeholder="Enter your encrypted message here..."></textarea>
        </div>

        <button id="decryptBtn" disabled>Decrypt Message</button>

        <div id="results" class="results"></div>
    </div>

    <script>
        let dictionary = new Set();

        document.getElementById('dictFile').addEventListener('change', function(e) {
            const file = e.target.files[0];
            if (file) {
                const reader = new FileReader();
                reader.onload = function(event) {
                    const text = event.target.result;
                    const words = text.split(/\r?\n/).map(w => w.trim().toLowerCase()).filter(w => w.length > 0);
                    dictionary = new Set(words);

                    document.getElementById('fileStatus').textContent =
                        `✓ Dictionary loaded: ${dictionary.size} words`;
                    document.getElementById('decryptBtn').disabled = false;
                };
                reader.readAsText(file);
            }
        });

        function caesarShift(text, shift) {
            return text.split('').map(char => {
                if (char.match(/[a-z]/i)) {
                    const code = char.charCodeAt(0);
                    const isUpper = char === char.toUpperCase();
                    const base = isUpper ? 65 : 97;
                    const shifted = ((code - base - shift + 26) % 26) + base;
                    return String.fromCharCode(shifted);
                }
                return char;
            }).join('');
        }

        function rot47Shift(text, shift) {
            return text.split('').map(char => {
                const code = char.charCodeAt(0);
                if (code >= 33 && code <= 126) {
                    const shifted = ((code - 33 - shift + 94) % 94) + 33;
                    return String.fromCharCode(shifted);
                }
                return char;
            }).join('');
        }

        function escapeHtml(text) {
            const div = document.createElement('div');
            div.textContent = text;
            return div.innerHTML;
        }

        function scoreText(text) {
            const words = text.toLowerCase().match(/\b[a-z]+\b/g) || [];
            let dictionaryMatches = 0;
            let totalScore = 0;

            // Count dictionary matches (only for words 3+ letters)
            let longWordCount = 0;
            for (const word of words) {
                if (word.length >= 3) {
                    longWordCount++;
                    if (dictionary.has(word)) {
                        dictionaryMatches++;
                    }
                }
            }

            const hasDictMatches = longWordCount >= 2 && dictionaryMatches >= 2;

            // Detect if this is primarily numeric content
            const digitCount = (text.match(/\d/g) || []).length;
            const alphaCount = (text.match(/[a-z]/gi) || []).length;
            const hasLetters = alphaCount > 0;
            const totalChars = text.replace(/\s/g, '').length; // Non-space characters
            const digitRatio = digitCount / totalChars;

            // ONLY use numeric mode if text is PURE numbers (no letters) and mostly digits
            const isNumeric = digitCount >= 5 && !hasLetters && digitRatio >= 0.6 && !hasDictMatches;

            if (isNumeric) {
                // Numeric scoring mode - VERY STRICT

                // Score 1: Valid number patterns - STRICTER
                const numberPatterns = text.match(/\b\d+\.?\d*\b|\b\d+,\d{3}\b/g) || [];
                const letterCount = (text.match(/[a-zA-Z]/g) || []).length;

                // Penalize if there are letters mixed in (not real numeric content)
                const letterPenalty = letterCount > 2 ? 0.3 : 1.0; // Severe penalty

                const numberScore = numberPatterns.length > 0 ? 100 : 0;
                totalScore += numberScore * 0.30 * letterPenalty; // 30% weight with penalty

                // Score 2: Must look like pure numeric data
                const numericRatio = digitCount / text.length;
                const purityScore = numericRatio >= 0.5 ? 100 : (numericRatio * 200);
                totalScore += purityScore * 0.25; // 25% weight

                // Score 3: Penalty for mixed alphanumeric garbage
                const mixedPattern = (text.match(/[a-z]\d|\d[a-z]/gi) || []).length;
                const mixedPenalty = Math.max(0, 100 - (mixedPattern * 30)); // Heavy penalty
                totalScore += mixedPenalty * 0.25; // 25% weight

                // Score 4: Reasonable punctuation for numbers
                const badPunctCount = (text.match(/[^0-9.,\-+$%\/\s]/g) || []).length;
                const punctScore = Math.max(0, 100 - (badPunctCount * 15));
                totalScore += punctScore * 0.20; // 20% weight

                return {
                    matches: numberPatterns.length,
                    total: numberPatterns.length,
                    percentage: 100,
                    totalScore: totalScore.toFixed(1),
                    mode: 'numeric'
                };
            } else {
                // Text scoring mode

                // Dictionary score based on long words only
                const dictScore = longWordCount > 0 ? (dictionaryMatches / longWordCount) * 100 : 0;
                totalScore += dictScore * 0.60; // 60% weight - INCREASED FURTHER!

                // Score 2: Common English bigrams (letter pairs)
                const commonBigrams = ['th', 'he', 'in', 'er', 'an', 'ed', 're', 'on', 'at', 'en',
                                       'nd', 'ti', 'es', 'or', 'te', 'of', 'st', 'ar', 'nt', 'to'];
                let bigramCount = 0;
                const lowerText = text.toLowerCase();
                for (const bigram of commonBigrams) {
                    const count = (lowerText.match(new RegExp(bigram, 'g')) || []).length;
                    bigramCount += count;
                }
                const bigramScore = Math.min((bigramCount / (text.length / 10)) * 100, 100);
                totalScore += bigramScore * 0.15; // 15% weight

                // Score 3: Reasonable spacing (spaces should be ~15-20% of text)
                const spaceCount = (text.match(/ /g) || []).length;
                const spaceRatio = spaceCount / text.length;
                const spaceScore = spaceRatio >= 0.10 && spaceRatio <= 0.25 ? 100 :
                                  (spaceRatio >= 0.05 && spaceRatio <= 0.35 ? 50 : 0);

                // Penalty for multiple consecutive spaces or weird spacing
                const multiSpace = (text.match(/  +/g) || []).length;
                const spacePenalty = Math.max(0, 100 - (multiSpace * 20));

                totalScore += (spaceScore * 0.7 + spacePenalty * 0.3) * 0.05; // 5% weight

                // Score 4: Penalty for non-standard characters mixed with text
                // Count characters that shouldn't appear in normal text
                const weirdChars = (text.match(/[^a-zA-Z0-9\s.,!?;:'"()\-]/g) || []).length;
                const weirdPenalty = Math.max(0, 100 - (weirdChars * 25)); // 25 points per weird char
                totalScore += weirdPenalty * 0.15; // 15% weight

                // Score 5: Penalty for weird trailing punctuation (/, \, |, ~, etc.)
                const trailingWeird = text.match(/[\/\\|~`@#$%^&*+=<>{}[\]]+$/);
                const trailingPenalty = trailingWeird ? 50 : 100; // Even stronger penalty
                totalScore += trailingPenalty * 0.05; // 5% weight

                // Score 6: Proper sentence ending bonus (ends with . ! ?)
                const properEnding = text.match(/[.!?]\s*$/);
                const endingBonus = properEnding ? 100 : 90; // Reduced penalty for no ending
                totalScore += endingBonus * 0.10; // 10% weight

                return {
                    matches: dictionaryMatches,
                    total: longWordCount,
                    percentage: longWordCount > 0 ? (dictionaryMatches / longWordCount * 100).toFixed(1) : 0,
                    totalScore: totalScore.toFixed(1),
                    mode: 'text'
                };
            }
        }

        document.getElementById('decryptBtn').addEventListener('click', function() {
            const encrypted = document.getElementById('encryptedText').value.trim();
            const cipherType = document.getElementById('cipherType').value;

            console.log('Decrypting:', encrypted, 'Type:', cipherType);

            if (!encrypted) {
                document.getElementById('results').innerHTML =
                    '<div class="error">Please enter an encrypted message.</div>';
                return;
            }

            if (dictionary.size === 0) {
                document.getElementById('results').innerHTML =
                    '<div class="error">Please upload a dictionary file first.</div>';
                return;
            }

            const results = [];
            console.log('Starting decryption...');

            if (cipherType === 'combined') {
                // Try ROT47 then Caesar (to decrypt messages encrypted Caesar then ROT47)
                for (let rot47S = 0; rot47S < 94; rot47S++) {
                    for (let caesarS = 0; caesarS < 26; caesarS++) {
                        const step1 = rot47Shift(encrypted, rot47S);
                        const step2 = caesarShift(step1, caesarS);
                        const score = scoreText(step2);
                        // Original encryption shifts are the same as decryption shifts
                        // because our functions already shift backward
                        results.push({
                            shift: `ROT47(${rot47S}) → Caesar(${caesarS})`,
                            encryptionShift: `Caesar(${caesarS}) → ROT47(${rot47S})`,
                            text: step2,
                            score: score
                        });
                    }
                }

                // Try Caesar then ROT47 (to decrypt messages encrypted ROT47 then Caesar)
                for (let caesarS = 0; caesarS < 26; caesarS++) {
                    for (let rot47S = 0; rot47S < 94; rot47S++) {
                        const step1 = caesarShift(encrypted, caesarS);
                        const step2 = rot47Shift(step1, rot47S);
                        const score = scoreText(step2);
                        // Original encryption shifts are the same as decryption shifts
                        results.push({
                            shift: `Caesar(${caesarS}) → ROT47(${rot47S})`,
                            encryptionShift: `ROT47(${rot47S}) → Caesar(${caesarS})`,
                            text: step2,
                            score: score
                        });
                    }
                }
            } else {
                // Single cipher mode (original logic)
                const maxShifts = cipherType === 'caesar' ? 26 : 94;
                const shiftFunc = cipherType === 'caesar' ? caesarShift : rot47Shift;

                for (let shift = 0; shift < maxShifts; shift++) {
                    const decrypted = shiftFunc(encrypted, shift);
                    const score = scoreText(decrypted);
                    results.push({
                        shift: shift,
                        text: decrypted,
                        score: score
                    });
                }
            }

            results.sort((a, b) => b.score.totalScore - a.score.totalScore);

            console.log('Total results:', results.length);
            console.log('Top 5 scores:', results.slice(0, 5).map(r => ({score: r.score.totalScore, text: r.text.substring(0, 30)})));

            // Get top candidates (within 0.5 points of best score)
            const bestScore = parseFloat(results[0].score.totalScore);
            const topCandidates = results.filter(r => parseFloat(r.score.totalScore) >= bestScore - 0.5);

            console.log('Top candidates:', topCandidates.length);

            // For combined mode, show results with good dictionary matches
            let displayResults;
            if (cipherType === 'combined') {
                // Show top 20 by score, plus any with 50%+ dictionary match
                const topByScore = results.slice(0, 20);
                const goodDictMatches = results.filter(r =>
                    r.score.mode === 'text' &&
                    r.score.total >= 3 &&
                    parseFloat(r.score.percentage) >= 50
                );
                // Combine and deduplicate
                const combined = [...topByScore, ...goodDictMatches];
                const seen = new Set();
                displayResults = combined.filter(r => {
                    const key = r.text;
                    if (seen.has(key)) return false;
                    seen.add(key);
                    return true;
                });
            } else {
                displayResults = results;
            }

            const cipherName = cipherType === 'caesar' ? 'Caesar Cipher' :
                              cipherType === 'rot47' ? 'ROT47' : 'Combined Cipher';
            let html = '<div class="all-results" style="margin-bottom: 30px;"><h3>🏆 Top Candidates (within 0.5 points)</h3>';

            topCandidates.slice(0, 5).forEach((candidate, index) => {
                const modeLabel = candidate.score.mode === 'numeric' ? 'Numeric Mode' : 'Text Mode';
                const badge = index === 0 ? '🥇' : index === 1 ? '🥈' : index === 2 ? '🥉' : '⭐';

                let shiftDisplay = '';
                if (cipherType === 'combined') {
                    shiftDisplay = `
                        <div style="background: #fff3cd; padding: 12px; border-radius: 6px; margin-bottom: 15px; font-size: 14px;">
                            <div style="margin-bottom: 5px;"><strong>Encrypted with:</strong> ${candidate.encryptionShift} (estimated)</div>
                            <div><strong>Decrypted using:</strong> ${candidate.shift}</div>
                        </div>
                    `;
                } else {
                    shiftDisplay = `
                        <div class="shift-info">
                            <span>Shift: ${candidate.shift}</span>
                            <span>Score: ${candidate.score.totalScore}/100 | ${candidate.score.mode === 'numeric' ? 'Numbers: ' + candidate.score.matches : 'Dict: ' + candidate.score.matches + '/' + candidate.score.total + ' (' + candidate.score.percentage + '%)'}</span>
                        </div>
                    `;
                }

                html += `
                    <div class="best-result" style="margin-bottom: 20px;">
                        <h2>${badge} Candidate ${index + 1} (${cipherName}) - ${modeLabel}</h2>
                        ${shiftDisplay}
                        ${cipherType === 'combined' ? '<div class="shift-info"><span></span><span>Score: ' + candidate.score.totalScore + '/100 | ' + (candidate.score.mode === 'numeric' ? 'Numbers: ' + candidate.score.matches : 'Dict: ' + candidate.score.matches + '/' + candidate.score.total + ' (' + candidate.score.percentage + '%)') + '</span></div>' : ''}
                        <div class="result-text">${escapeHtml(candidate.text)}</div>
                    </div>
                `;
            });

            html += '</div>';
            html += '</div>';

            html += `
                <div class="all-results">
                    <h3>All Top ${displayResults.length} Results (sorted by score)</h3>
            `;

            displayResults.forEach(r => {
                const scoreDisplay = r.score.mode === 'numeric'
                    ? `Score: ${r.score.totalScore}/100 | Numbers: ${r.score.matches}`
                    : `Score: ${r.score.totalScore}/100 | Dict: ${r.score.matches}/${r.score.total} (${r.score.percentage}%)`;

                const shiftLabel = cipherType === 'combined'
                    ? `<div style="font-size: 12px; color: #888; margin-top: 3px;">Encrypted: ${r.encryptionShift}</div><div style="font-size: 12px;">Decrypted: ${r.shift}</div>`
                    : `Shift ${r.shift}`;

                html += `
                    <div class="result-item">
                        <div class="result-header">
                            <span>${shiftLabel}</span>
                            <span>${scoreDisplay}</span>
                        </div>
                        <div class="result-preview">${escapeHtml(r.text)}</div>
                    </div>
                `;
            });

            if (cipherType === 'combined') {
                html += `<p style="color: #668; margin-top: 15px; text-align: center;">
                    Showing ${displayResults.length} results (top scores + good dictionary matches from 4,888 combinations)
                </p>`;
            }

            html += '</div>';

            document.getElementById('results').innerHTML = html;
        });
    </script>
</body>
</html>