diff --git a/cc.html b/cc.html
new file mode 100644
index 0000000..07b7410
--- /dev/null
+++ b/cc.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+</head>
+<body>
+    <form action="cc.php" method="POST">
+        text<input type="text" name="plaintext" id="plaintext">
+        key<input type="number" name="key" id="key">
+        <input type="submit" value="submit">
+    </form>
+</body>
+</html>
\ No newline at end of file
diff --git a/cc.php b/cc.php
new file mode 100644
index 0000000..2f04051
--- /dev/null
+++ b/cc.php
@@ -0,0 +1,28 @@
+<?php
+   function shiftAndReplace($input, $shift){
+        $output = "";
+        for ($i = 0 ; $i < strlen($input); $i++) {
+            $ch = $input[$i];
+            if (ctype_alpha($ch)) {
+                $base = ctype_upper($ch) ? 'A' : 'a';
+                $ch = chr(((ord($ch) - ord($base) + $shift) % 26 + 26) % 26 + ord($base));
+                if ($ch == 'a') {
+                    $ch = 'z';
+                } else if ($ch == 'z') {
+                    $ch = 'a';
+                }
+            }
+            $output .= $ch;
+        }
+        return $output;
+    }
+
+    function encrypt($input, $shift){
+        return shiftAndReplace($input, 26 - $shift);
+    }
+
+   $plaintext=$_POST['plaintext'];
+   $key=$_POST['key'];
+   $ciphertext=encrypt($plaintext,$key);
+   echo 'Ciphertext is: ' . $ciphertext;
+?>
