diff --git a/src/main/java/de/tudbut/tools/encryption/RawKey.java b/src/main/java/de/tudbut/tools/encryption/RawKey.java
index 5fab806..68678bd 100644
--- a/src/main/java/de/tudbut/tools/encryption/RawKey.java
+++ b/src/main/java/de/tudbut/tools/encryption/RawKey.java
@@ -45,7 +45,20 @@ public class RawKey extends Key {
      * @return encrypted string
      */
     public String encryptString(String s) {
-        byte[] bytes = s.getBytes(StandardCharsets.ISO_8859_1);
+        return new String(encryptBytes(string.getBytes(StandardCharsets.ISO_8859_1)), StandardCharsets.ISO_8859_1);
+    }
+    
+    /**
+     * Decrypts a string
+     * @param s string to decrypt
+     * @return decrypted string
+     */
+    public String decryptString(String s) {
+        return new String(decryptBytes(string.getBytes(StandardCharsets.ISO_8859_1)), StandardCharsets.ISO_8859_1);
+    }
+
+    public byte[] encryptBytes(byte[] bytes) {
+        bytes = bytes.clone();
         byte[] eb = string.getBytes(StandardCharsets.ISO_8859_1);
         int len = bytes.length;
         int p = eb.length;
@@ -55,16 +68,11 @@ public class RawKey extends Key {
                 bytes[idx] = (byte) ((int) bytes[idx] + (int) eb[j]);
             }
         }
-        return new String(bytes, StandardCharsets.ISO_8859_1);
+        return bytes;
     }
-    
-    /**
-     * Decrypts a string
-     * @param s string to decrypt
-     * @return decrypted string
-     */
-    public String decryptString(String s) {
-        byte[] bytes = s.getBytes(StandardCharsets.ISO_8859_1);
+
+    public byte[] decryptBytes(byte[] bytes) {
+        bytes = bytes.clone();
         byte[] eb = string.getBytes(StandardCharsets.ISO_8859_1);
         int len = bytes.length;
         int p = eb.length;
@@ -74,7 +82,7 @@ public class RawKey extends Key {
                 bytes[idx] = (byte) ((int) bytes[idx] - (int) eb[j]);
             }
         }
-        return new String(bytes, StandardCharsets.ISO_8859_1);
+        return bytes;
     }
     
     @Override