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ryfe24/README.html 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Encryption and Decryption Kelompok</title>
</head>
<body>
    <h1>Encryption and Decryption Kelompok Kece</h1>

    <h2>Encryption</h2>
    <form>
        <label for="plain-text">Enter a message to encrypt:</label>
        <input type="text" name="plain-text" id="plain-text" required>
        <label for="encryption-key">Enter an encryption key (0-255):</label>
        <input type="number" name="encryption-key" id="encryption-key" min="0" max="255" required>
        <button type="button" onclick="encrypt()">Encrypt</button>
    </form>

    <h2>Decryption</h2>
    <form>
        <label for="cipher-text">Enter a message to decrypt:</label>
        <input type="text" name="cipher-text" id="cipher-text" required>
        <label for="decryption-key">Enter a decryption key (0-255):</label>
        <input type="number" name="decryption-key" id="decryption-key" min="0" max="255" required>
        <button type="button" onclick="decrypt()">Decrypt</button>
    </form>

    <h2>Results</h2>
    <div id="results">
        <p>Original message: <span id="original-message"></span></p>
        <p>Encrypted/Decrypted message: <span id="result-message"></span></p>
    </div>

    <script>
        function updateResults(original, result) {
            document.getElementById("original-message").textContent = original;
            document.getElementById("result-message").textContent = result;
        }

        function encrypt() {
            var plainText = document.getElementById("plain-text").value;
            var key = parseInt(document.getElementById("encryption-key").value);

            var encryptedText = "";

            for (var i = 0; i < plainText.length; i++) {
                var charCode = plainText.charCodeAt(i);
                encryptedText += String.fromCharCode((charCode + key) % 256);
            }

            updateResults(plainText, encryptedText);
        }

        function decrypt() {
            var cipherText = document.getElementById("cipher-text").value;
            var key = parseInt(document.getElementById("decryption-key").value);

            var decryptedText = "";

            for (var i = 0; i < cipherText.length; i++) {
                var charCode = cipherText.charCodeAt(i);
                decryptedText += String.fromCharCode((charCode - key + 256) % 256);
            }

            updateResults(cipherText, decryptedText);
        }
    </script>
</body>
</html>

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