Caesar-cipher/Caeser Cipher.html at main · mahmed-eng/Caesar-cipher · 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</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            text-align: center;
            margin: 50px;
            background-color: #f5f5f5;
        }

        .container {
            max-width: 400px;
            margin: auto;
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        input, button {
            width: 100%;
            margin: 10px 0;
            padding: 12px;
            font-size: 16px;
            box-sizing: border-box;
        }

        button {
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

        button:hover {
            background-color: #45a049;
        }

        h2, h3 {
            color: #333;
        }

        #result {
            margin-top: 20px;
            font-size: 18px;
            color: #333;
        }
    </style>
</head>
<body>

    <div class="container">
        <h2>Caesar Cipher</h2>

        <label for="plainText">Enter Plain Text:</label>
        <input type="text" id="plainText" placeholder="Enter text">

        <label for="shift">Enter Shift Value:</label>
        <input type="number" id="shift" placeholder="Enter shift value">

        <button onclick="encrypt()">Encrypt</button>
        <button onclick="decrypt()">Decrypt</button>

        <h3>Result:</h3>
        <p id="result"></p>
    </div>

    <script>
        function encrypt() {
            var plainText = document.getElementById("plainText").value.toUpperCase();
            var shift = parseInt(document.getElementById("shift").value);
            var result = "";

            for (var i = 0; i < plainText.length; i++) {
                var charCode = plainText.charCodeAt(i);

                if (charCode >= 65 && charCode <= 90) { // Uppercase letters only
                    result += String.fromCharCode(((charCode - 65 + shift) % 26) + 65);
                } else {
                    result += plainText[i]; // Leave non-alphabetic characters unchanged
                }
            }

            document.getElementById("result").innerText = "Encrypted Text: " + result;
        }

        function decrypt() {
            var cipherText = document.getElementById("plainText").value.toUpperCase();
            var shift = parseInt(document.getElementById("shift").value);
            var result = "";

            for (var i = 0; i < cipherText.length; i++) {
                var charCode = cipherText.charCodeAt(i);

                if (charCode >= 65 && charCode <= 90) { // Uppercase letters only
                    result += String.fromCharCode(((charCode - 65 - shift + 26) % 26) + 65);
                } else {
                    result += cipherText[i]; // Leave non-alphabetic characters unchanged
                }
            }

            document.getElementById("result").innerText = "Decrypted Text: " + result;
        }
    </script>

</body>
</html>