Security-App/polyalphabetic.html at main · khalidkaram22/Security-App · 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>Polyalphabetic Cipher</title>
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
</head>
<body class="bg-gray-100 font-sans">
    <!-- Navbar -->
    <nav class="bg-gray-800 p-4">
        <div class="max-w-7xl mx-auto flex justify-around">
            <a href="trasposition.html" class="text-white text-lg hover:text-blue-400">Transposition </a>
            <a href="rsaImplementation.html" class="text-white text-lg hover:text-blue-400">RSA</a>
            <a href="polyalphabetic.html" class="text-white text-lg hover:text-blue-400">polyalphabetic</a>
            <a href="index.html" class="text-white text-lg hover:text-blue-400">playfair</a>
        </div>
    </nav>

    <!-- Main Content -->
    <div class="max-w-3xl mx-auto mt-8 bg-white p-8 rounded-lg shadow-lg">
        <h1 class="text-3xl font-bold mb-6 text-center text-gray-800">Polyalphabetic Cipher</h1>

        <div class="mb-4">
            <label for="message" class="block text-sm font-medium text-gray-700">Message</label>
            <textarea id="message" rows="4" class="mt-1 block w-full border border-gray-300 rounded-md p-2 focus:outline-none focus:ring-2 focus:ring-blue-500"></textarea>
        </div>

        <div class="mb-4">
            <label for="key" class="block text-sm font-medium text-gray-700">Key</label>
            <input type="text" id="key" placeholder="Enter key" class="mt-1 block w-full border border-gray-300 rounded-md p-2 focus:outline-none focus:ring-2 focus:ring-blue-500">
        </div>

        <div class="mb-4">
            <label for="operation" class="block text-sm font-medium text-gray-700">Operation</label>
            <select id="operation" class="mt-1 block w-full border border-gray-300 rounded-md p-2 focus:outline-none focus:ring-2 focus:ring-blue-500">
                <option value="encrypt">Encrypt</option>
                <option value="decrypt">Decrypt</option>
            </select>
        </div>

        <button onclick="processText()" class="bg-green-500 text-white px-4 py-2 rounded-md hover:bg-green-600 mb-4">Process</button>

        <div class="result mb-4">
            <h3 class="text-lg font-semibold text-gray-800">Result:</h3>
            <p id="result" class="text-gray-700"></p>
        </div>

        <!-- <div class="container mt-8 bg-gray-50 p-8 rounded-lg shadow-lg">
            <h2 class="text-xl font-semibold text-gray-800">Cipher Reference</h2>
            <p class="text-sm text-gray-600">Formula: P = (c - K) mod 26</p>
            <table class="table-auto w-full mt-4">
                <thead>
                    <tr>
                        <th class="px-4 py-2 border">A</th><th class="px-4 py-2 border">B</th><th class="px-4 py-2 border">C</th><th class="px-4 py-2 border">D</th><th class="px-4 py-2 border">E</th>
                        <th class="px-4 py-2 border">F</th><th class="px-4 py-2 border">G</th><th class="px-4 py-2 border">H</th><th class="px-4 py-2 border">I</th><th class="px-4 py-2 border">J</th>
                        <th class="px-4 py-2 border">K</th><th class="px-4 py-2 border">L</th><th class="px-4 py-2 border">M</th><th class="px-4 py-2 border">N</th><th class="px-4 py-2 border">O</th>
                        <th class="px-4 py-2 border">P</th><th class="px-4 py-2 border">Q</th><th class="px-4 py-2 border">R</th><th class="px-4 py-2 border">S</th><th class="px-4 py-2 border">T</th>
                        <th class="px-4 py-2 border">U</th><th class="px-4 py-2 border">V</th><th class="px-4 py-2 border">W</th><th class="px-4 py-2 border">X</th><th class="px-4 py-2 border">Y</th>
                        <th class="px-4 py-2 border">Z</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td class="px-4 py-2 border">0</td><td class="px-4 py-2 border">1</td><td class="px-4 py-2 border">2</td><td class="px-4 py-2 border">3</td><td class="px-4 py-2 border">4</td>
                        <td class="px-4 py-2 border">5</td><td class="px-4 py-2 border">6</td><td class="px-4 py-2 border">7</td><td class="px-4 py-2 border">8</td><td class="px-4 py-2 border">9</td>
                        <td class="px-4 py-2 border">10</td><td class="px-4 py-2 border">11</td><td class="px-4 py-2 border">12</td><td class="px-4 py-2 border">13</td><td class="px-4 py-2 border">14</td>
                        <td class="px-4 py-2 border">15</td><td class="px-4 py-2 border">16</td><td class="px-4 py-2 border">17</td><td class="px-4 py-2 border">18</td><td class="px-4 py-2 border">19</td>
                        <td class="px-4 py-2 border">20</td><td class="px-4 py-2 border">21</td><td class="px-4 py-2 border">22</td><td class="px-4 py-2 border">23</td><td class="px-4 py-2 border">24</td>
                        <td class="px-4 py-2 border">25</td>
                    </tr>
                </tbody>
            </table>
        </div>

        <div class="mt-8">
            <h3 class="text-lg font-semibold text-gray-800">Example from Image:</h3>
            <p>Original: "Group meeting will be on bridge at"</p>
            <p>Key: "individual"</p>
            <p>Encrypted: "initiv idualindividual individu"</p>
        </div> -->
    </div>

    <script>
        const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        const charToNum = {};
        const numToChar = {};

        for (let i = 0; i < alphabet.length; i++) {
            charToNum[alphabet[i]] = i;
            numToChar[i] = alphabet[i];
        }

        function processText() {
            const message = document.getElementById('message').value.toUpperCase().replace(/[^A-Z]/g, '');
            const key = document.getElementById('key').value.toUpperCase().replace(/[^A-Z]/g, '');
            const operation = document.getElementById('operation').value;

            if (!message || !key) {
                alert('Please enter both message and key');
                return;
            }

            let result = '';

            if (operation === 'encrypt') {
                result = encrypt(message, key);
            } else {
                result = decrypt(message, key);
            }

            document.getElementById('result').textContent = result;
        }

        function encrypt(plaintext, key) {
            let ciphertext = '';
            const keyLength = key.length;

            for (let i = 0; i < plaintext.length; i++) {
                const plainChar = plaintext[i];
                const keyChar = key[i % keyLength];

                const plainNum = charToNum[plainChar];
                const keyNum = charToNum[keyChar];

                const cipherNum = (plainNum + keyNum) % 26;
                ciphertext += numToChar[cipherNum];

                if ((i + 1) % 5 === 0) {
                    ciphertext += ' ';
                }
            }

            return ciphertext.trim();
        }

        function decrypt(ciphertext, key) {
            let plaintext = '';
            const keyLength = key.length;

            for (let i = 0; i < ciphertext.length; i++) {
                const cipherChar = ciphertext[i];
                const keyChar = key[i % keyLength];

                const cipherNum = charToNum[cipherChar];
                const keyNum = charToNum[keyChar];

                let plainNum = (cipherNum - keyNum) % 26;
                if (plainNum < 0) {
                    plainNum += 26;
                }
                plaintext += numToChar[plainNum];
            }

            return plaintext;
        }
    </script>
</body>
</html>