diff --git a/src/org/blueshard/cryptogx/EnDecrypt.java b/src/org/blueshard/cryptogx/EnDecrypt.java
index 2a49c3b..af76c16 100644
--- a/src/org/blueshard/cryptogx/EnDecrypt.java
+++ b/src/org/blueshard/cryptogx/EnDecrypt.java
@@ -5,18 +5,28 @@ import javax.crypto.spec.PBEKeySpec;
 import javax.crypto.spec.SecretKeySpec;
 import java.io.*;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.security.*;
 import java.security.spec.InvalidKeySpecException;
 import java.security.spec.KeySpec;
-import java.util.Arrays;
-import java.util.Base64;
+import java.util.*;
+import java.util.concurrent.atomic.AtomicBoolean;
 
+/**
+ * <p>Class for en- / decrypt text and files<p/>
+ *
+ * @since 1.0.0
+ */
 public class EnDecrypt {
 
     public static class AES extends Thread {
 
-        private int iterations = 1000;
-        private int keyLength = 256;
+        public int iterations = 65536;
+
+        private final String secretKeyFactoryAlgorithm = "PBKDF2WithHmacSHA1";
+        private int keySize = 256;
 
         private final String key;
         private final byte[] salt;
@@ -26,31 +36,31 @@ public class EnDecrypt {
             this.salt = salt;
         }
 
-        public AES(String key, byte[] salt, int iterations) {
+        public AES(String key, byte[] salt, int keySize) {
             this.key = key;
             this.salt = salt;
-            this.iterations = iterations;
+            this.keySize = keySize;
         }
 
-        public AES(String key, byte[] salt, int iterations, int keyLength) {
+        public AES(String key, byte[] salt, int iterations, int keySize) {
             this.key = key;
             this.salt = salt;
             this.iterations = iterations;
-            this.keyLength = keyLength;
+            this.keySize = keySize;
         }
 
         /**
          * <p>Creates a secret key from given (plain text) key and salt</p>
          *
-         * @param key from which a secret key should be created
-         * @param salt from which a secret key should be created
          * @return the secret key
          * @throws NoSuchAlgorithmException
          * @throws InvalidKeySpecException
+         *
+         * @since 1.0.0
          */
-        public byte[] createSecretKey(String key, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
-            KeySpec keySpec = new PBEKeySpec(key.toCharArray(), salt, this.iterations, keyLength);
-            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512");
+        private byte[] createSecretKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
+            SecretKeyFactory factory = SecretKeyFactory.getInstance(secretKeyFactoryAlgorithm);
+            PBEKeySpec keySpec = new PBEKeySpec(key.toCharArray(), salt, iterations, keySize);
 
             return factory.generateSecret(keySpec).getEncoded();
         }
@@ -62,8 +72,10 @@ public class EnDecrypt {
          * @param outputStream to which is written
          * @param buffer
          * @throws IOException
+         *
+         * @since 1.12.0
          */
-        public static void writeLineByLine(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws IOException {
+        private void write(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws IOException {
             int numOfBytesRead;
             while ((numOfBytesRead = inputStream.read(buffer)) != -1) {
                 outputStream.write(buffer, 0, numOfBytesRead);
@@ -73,103 +85,81 @@ public class EnDecrypt {
         }
 
         /**
-         * <p>Encrypts a file randomly line by line</p>
-         *
-         * @see EnDecrypt.AES#encryptRandomLineByLine(InputStream, OutputStream, byte[])
-         */
-        public static void encryptFileRandomLineByLine(File inputFile, File outputFile, byte[] buffer) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, InvalidAlgorithmParameterException {
-            encryptRandomLineByLine(new FileInputStream(inputFile), new FileOutputStream(outputFile), buffer);
-        }
-
-        /**
-         * <p>Encrypts a {@link InputStream} randomly line by line</p>
+         * <p>Encrypts the {@param inputStream} to {@param outputStream}</p>
          *
          * @param inputStream that should be encrypted
-         * @param outputStream to which the encrypted {@param inputStream} should be written to
+         * @param outputStream to which the encrypted {@param inputFile} should be written to
          * @param buffer
+         * @throws InvalidKeySpecException
          * @throws NoSuchAlgorithmException
          * @throws NoSuchPaddingException
          * @throws InvalidKeyException
          * @throws IOException
-         * @throws InvalidAlgorithmParameterException
+         *
+         * @since 1.12.0
          */
-        public static void encryptRandomLineByLine(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, InvalidAlgorithmParameterException {
-            KeyGenerator randomKey = KeyGenerator.getInstance("AES");
-            Key secretKey = new SecretKeySpec(randomKey.generateKey().getEncoded(), "AES");
+        public void encryptFile(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException {
+            Key secretKey = new SecretKeySpec(createSecretKey(), "AES");
 
             Cipher cipher = Cipher.getInstance("AES");
             cipher.init(Cipher.ENCRYPT_MODE, secretKey);
 
             CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
-            writeLineByLine(cipherInputStream, outputStream, buffer);
+            write(cipherInputStream, outputStream, buffer);
         }
 
         /**
-         * <p>En- / decrypts the {@param inputFile}</p>
+         * <p>Encrypts all files in the {@param inputDirectory} to the {@param outputDirectory}</p>
          *
-         * @param cipherMode says if the file should be en- or decrypted
-         * @param inputFile that should be en- / decrypted
-         * @param outputFile to which the en- / decrypted {@param inputFile} should be written to
+         * @param inputDirectory that should be encrypted
+         * @param outputDirectory to which the encrypted {@param inputDirectory} files should be written to
+         * @param fileEnding get added to every file that gets encrypted (if the {@param fileEnding} starts and ends with
+         * a '@', the {@param fileEnding} will get removed from the file if it exists)
+         * @param buffer
          * @throws InvalidKeySpecException
          * @throws NoSuchAlgorithmException
          * @throws NoSuchPaddingException
          * @throws InvalidKeyException
          * @throws IOException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
+         *
+         * @since 1.12.0
          */
-        public void enDecryptFileAllInOne(int cipherMode, File inputFile, File outputFile) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, BadPaddingException, IllegalBlockSizeException {
-            Key secretKey = new SecretKeySpec(createSecretKey(key, salt), "AES");
+        public void encryptDirectory(String inputDirectory, String outputDirectory, String fileEnding, byte[] buffer) throws IOException, NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException, NoSuchPaddingException {
+            AtomicBoolean remove = new AtomicBoolean(false);
 
-            Cipher cipher = Cipher.getInstance("AES");
-            cipher.init(cipherMode, secretKey);
+            if (fileEnding == null) {
+                fileEnding = "";
+            } else if (fileEnding.startsWith("@") && fileEnding.endsWith("@")) {
+                fileEnding = fileEnding.substring(1, fileEnding.length() - 1);
+                remove.set(true);
+            }
 
-            FileInputStream inputStream = new FileInputStream(inputFile);
-            byte[] inputBytes = new byte[(int) inputFile.length()];
-            inputStream.read(inputBytes);
+            HashMap<File, File> files = new HashMap<>();
+            final String finalFileEnding = fileEnding;
+            Files.walk(Paths.get(inputDirectory)).map(Path::toFile).forEach(oldFile -> {
+                String oldFilePath = oldFile.getAbsolutePath();
+                if (oldFile.isDirectory()) {
+                    new File(oldFilePath.replace(inputDirectory, outputDirectory + "/")).mkdir();
+                }else if (remove.get() && oldFilePath.endsWith(finalFileEnding)) {
+                    files.put(oldFile, new File(oldFilePath.substring(0, oldFilePath.lastIndexOf(finalFileEnding))
+                            .replace(inputDirectory, outputDirectory + "/") + finalFileEnding));
+                } else {
+                    files.put(oldFile, new File(oldFilePath.replace(inputDirectory, outputDirectory + "/") + finalFileEnding));
+                }
+            });
 
-            byte[] outputBytes = cipher.doFinal(inputBytes);
-
-            FileOutputStream outputStream = new FileOutputStream(outputFile);
-            outputStream.write(outputBytes);
-
-            inputStream.close();
-            outputStream.close();
+            File newFile;
+            for (Map.Entry<File, File> entry: files.entrySet()) {
+                newFile = entry.getValue();
+                encryptFile(new FileInputStream(entry.getKey()), new FileOutputStream(newFile), buffer);
+            }
         }
 
         /**
-         * <p>En- / decrypts the {@param inputBytes}</p>
+         * <p>Decrypts the {@param inputStream} to {@param outputStream}</p>
          *
-         * @param cipherMode says if the file should be en- or decrypted
-         * @param inputBytes that should be en- / decrypted
-         * @param outputStream to which the en- / decrypted {@param inputFile} should be written to
-         * @throws InvalidKeySpecException
-         * @throws NoSuchAlgorithmException
-         * @throws NoSuchPaddingException
-         * @throws InvalidKeyException
-         * @throws IOException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         */
-        public void enDecryptFileAllInOne(int cipherMode, byte[] inputBytes, OutputStream outputStream) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, BadPaddingException, IllegalBlockSizeException {
-            Key secretKey = new SecretKeySpec(createSecretKey(key, salt), "AES");
-
-            Cipher cipher = Cipher.getInstance("AES");
-            cipher.init(cipherMode, secretKey);
-
-            byte[] outputBytes = cipher.doFinal(inputBytes);
-
-            outputStream.write(outputBytes);
-
-            outputStream.close();
-        }
-
-        /**
-         * <p>En- / decrypts the {@param inputFile}</p>
-         *
-         * @param cipherMode says if the file should be en- or decrypted
-         * @param inputFile that should be en- / decrypted
-         * @param outputFile to which the en- / decrypted {@param inputFile} should be written to
+         * @param inputStream that should be decrypted
+         * @param outputStream to which the decrypted {@param inputFile} should be written to
          * @param buffer
          * @throws InvalidKeySpecException
          * @throws NoSuchAlgorithmException
@@ -177,178 +167,65 @@ public class EnDecrypt {
          * @throws InvalidKeyException
          * @throws IOException
          * @throws InvalidAlgorithmParameterException
+         *
+         * @since 1.12.0
          */
-        public void enDecryptLineByLine(int cipherMode, File inputFile, File outputFile, byte[] buffer) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, InvalidAlgorithmParameterException {
-            Key secretKey = new SecretKeySpec(createSecretKey(key, salt), "AES");
+        public void decryptFile(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException{
+            Key secretKey = new SecretKeySpec(createSecretKey(), "AES");
 
             Cipher cipher = Cipher.getInstance("AES");
-            cipher.init(cipherMode, secretKey);
+            cipher.init(Cipher.DECRYPT_MODE, secretKey);
 
-            FileInputStream fileInputStream = new FileInputStream(inputFile);
-            FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
-
-            if (cipherMode == Cipher.ENCRYPT_MODE) {
-                CipherInputStream cipherInputStream = new CipherInputStream(fileInputStream, cipher);
-                writeLineByLine(cipherInputStream, fileOutputStream, buffer);
-            } else if (cipherMode == Cipher.DECRYPT_MODE) {
-                CipherOutputStream cipherOutputStream = new CipherOutputStream(fileOutputStream, cipher);
-                writeLineByLine(fileInputStream, cipherOutputStream, buffer);
-            }
+            CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher);
+            write(inputStream, cipherOutputStream, buffer);
         }
 
         /**
-         * <p>En- / decrypts the {@param inputStream}</p>
+         * <p>Decrypts all files in the {@param inputDirectory} to the {@param outputDirectory}</p>
          *
-         * @param cipherMode says if the file should be en- or decrypted
-         * @param inputStream that should be en- / decrypted
-         * @param outputStream to which the en- / decrypted {@param inputFile} should be written to
+         * @param inputDirectory that should be decrypted
+         * @param outputDirectory to which the decrypted {@param inputDirectory} files should be written to
+         * @param fileEnding get added to every file that gets decrypted (if the {@param fileEnding} starts and ends with
+         * a '@', the {@param fileEnding} will get removed from the file if it exists)
          * @param buffer
          * @throws InvalidKeySpecException
          * @throws NoSuchAlgorithmException
          * @throws NoSuchPaddingException
          * @throws InvalidKeyException
          * @throws IOException
-         * @throws InvalidAlgorithmParameterException
+         *
+         * @since 1.12.0
          */
-        public void enDecryptLineByLine(int cipherMode, InputStream inputStream, OutputStream outputStream, byte[] buffer) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, InvalidAlgorithmParameterException {
-            Key secretKey = new SecretKeySpec(createSecretKey(key, salt), "AES");
+        public void decryptDirectory(String inputDirectory, String outputDirectory, String fileEnding, byte[] buffer) throws IOException, NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException, NoSuchPaddingException {
+            AtomicBoolean remove = new AtomicBoolean(false);
 
-            Cipher cipher = Cipher.getInstance("AES");
-            cipher.init(cipherMode, secretKey);
-
-            if (cipherMode == Cipher.ENCRYPT_MODE) {
-                CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
-                writeLineByLine(cipherInputStream, outputStream, buffer);
-            } else if (cipherMode == Cipher.DECRYPT_MODE) {
-                CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher);
-                writeLineByLine(inputStream, cipherOutputStream, buffer);
+            if (fileEnding == null) {
+                fileEnding = "";
+            } else if (fileEnding.startsWith("@") && fileEnding.endsWith("@")) {
+                fileEnding = fileEnding.substring(1, fileEnding.length() - 1);
+                remove.set(true);
             }
-        }
 
-        /**
-         * <p>Encrypt {@param bytes} randomly</p>
-         *
-         * @see EnDecrypt.AES#encryptRandom(byte[])
-         */
-        public static String encryptRandom(String string) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
-            return encryptRandom(string.getBytes(StandardCharsets.UTF_8));
-        }
+            HashMap<File, File> files = new HashMap<>();
+            final String finalFileEnding = fileEnding;
+            Files.walk(Paths.get(inputDirectory)).map(Path::toFile).forEach(oldFile -> {
+                String oldFilePath = oldFile.getAbsolutePath();
+                if (oldFile.isDirectory()) {
+                    new File(oldFilePath.replace(inputDirectory, outputDirectory + "/")).mkdir();
+                }
+                else if (remove.get() && oldFilePath.endsWith(finalFileEnding)) {
+                    files.put(oldFile, new File(oldFilePath.substring(0, oldFilePath.lastIndexOf(finalFileEnding))
+                            .replace(inputDirectory, outputDirectory + "/") + finalFileEnding));
+                } else {
+                    files.put(oldFile, new File(oldFilePath.replace(inputDirectory, outputDirectory + "/") + finalFileEnding));
+                }
+            });
 
-        /**
-         * <p>Encrypt {@param bytes} randomly</p>
-         *
-         * @param bytes that should be encrypted
-         * @return the encrypted {@param bytes} as {@link String}
-         * @throws NoSuchPaddingException
-         * @throws NoSuchAlgorithmException
-         * @throws InvalidKeyException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         */
-        public static String encryptRandom(byte[] bytes) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
-            KeyGenerator randomKey = KeyGenerator.getInstance("AES");
-            Key secretKey = new SecretKeySpec(randomKey.generateKey().getEncoded(), "AES");
-
-            Cipher encryptRandomCipher = Cipher.getInstance("AES");
-            encryptRandomCipher.init(Cipher.ENCRYPT_MODE, secretKey);
-            return Base64.getEncoder().encodeToString(encryptRandomCipher.doFinal(bytes));
-        }
-
-        /**
-         * <p>Encrypts a file randomly at once</p>
-         *
-         * @see EnDecrypt.AES#encryptFileRandomAllInOne(File, File)
-         */
-        public static void encryptFileRandomAllInOne(String inputFilename, String outputFilename) throws NoSuchPaddingException, NoSuchAlgorithmException, IOException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException {
-            encryptFileRandomAllInOne(new File(inputFilename), new File(outputFilename));
-        }
-
-        /**
-         * <p>Encrypts a file randomly at once</p>
-         *
-         * @param inputFile that should be encrypted
-         * @param outputFile to which the encrypted file should be written to
-         * @throws NoSuchAlgorithmException
-         * @throws NoSuchPaddingException
-         * @throws InvalidKeyException
-         * @throws IOException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         */
-        public static void encryptFileRandomAllInOne(File inputFile, File outputFile) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, BadPaddingException, IllegalBlockSizeException {
-            KeyGenerator randomKey = KeyGenerator.getInstance("AES");
-            Key secretKey = new SecretKeySpec(randomKey.generateKey().getEncoded(), "AES");
-
-            Cipher cipher = Cipher.getInstance("AES");
-            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
-
-            FileInputStream inputStream = new FileInputStream(inputFile);
-            byte[] inputBytes = new byte[(int) inputFile.length()];
-            inputStream.read(inputBytes);
-
-            byte[] outputBytes = cipher.doFinal(inputBytes);
-
-            FileOutputStream outputStream = new FileOutputStream(outputFile);
-            outputStream.write(outputBytes);
-
-            inputStream.close();
-            outputStream.close();
-        }
-
-        /**
-         * <p>Encrypts {@param inputFilename} randomly line by line and write it to {@param outputFilename}</p>
-         *
-         * @see EnDecrypt.AES#encryptRandomLineByLine(InputStream, OutputStream, byte[])
-         */
-        public static void encryptFileRandomLineByLine(String inputFilename, String outputFilename) throws InvalidKeyException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchPaddingException, IOException {
-            encryptRandomLineByLine(new FileInputStream(inputFilename), new FileOutputStream(outputFilename), new byte[64]);
-        }
-
-        /**
-         * <p>Encrypts {@param inputFilename} randomly line by line and write it to {@param outputFilename}</p>
-         *
-         * @see EnDecrypt.AES#encryptRandomLineByLine(InputStream, OutputStream, byte[])
-         */
-        public static void encryptFileRandomLineByLine(String inputFilename, String outputFilename, byte[] buffer) throws InvalidKeyException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchPaddingException, IOException {
-            encryptRandomLineByLine(new FileInputStream(inputFilename), new FileOutputStream(outputFilename), buffer);
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param encryptedString}</p>
-         *
-         * @see EnDecrypt.AES#decrypt(byte[])
-         */
-        public String decrypt(String encryptedString) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
-            Key secretKey = new SecretKeySpec(createSecretKey(key, salt), "AES");
-
-            Cipher decryptCipher = Cipher.getInstance("AES");
-            decryptCipher.init(Cipher.DECRYPT_MODE, secretKey);
-            return new String(decryptCipher.doFinal(Base64.getDecoder().decode(encryptedString)), StandardCharsets.UTF_8);
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param bytes}</p>
-         *
-         * @param bytes that should be decrypted
-         * @return decrypted bytes
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         * @throws NoSuchPaddingException
-         * @throws NoSuchAlgorithmException
-         * @throws InvalidKeySpecException
-         * @throws InvalidKeyException
-         */
-        public byte[] decrypt(byte[] bytes) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
-            return decrypt(Arrays.toString(bytes)).getBytes(StandardCharsets.UTF_8);
-        }
-
-        /**
-         * <p>Encrypt {@param bytes}</p>
-         *
-         * @see EnDecrypt.AES#encrypt(byte[])
-         */
-        public String encrypt(String string) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
-            return Base64.getEncoder().encodeToString(encrypt(string.getBytes(StandardCharsets.UTF_8)));
+            File newFile;
+            for (Map.Entry<File, File> entry: files.entrySet()) {
+                newFile = entry.getValue();
+                decryptFile(new FileInputStream(entry.getKey()), new FileOutputStream(newFile), buffer);
+            }
         }
 
         /**
@@ -362,9 +239,11 @@ public class EnDecrypt {
          * @throws NoSuchAlgorithmException
          * @throws InvalidKeySpecException
          * @throws InvalidKeyException
+         *
+         * @since 1.0.0
          */
         public byte[] encrypt(byte[] bytes) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
-            Key secretKey = new SecretKeySpec(createSecretKey(key, salt), "AES");
+            Key secretKey = new SecretKeySpec(createSecretKey(), "AES");
 
             Cipher encryptCipher = Cipher.getInstance("AES");
             encryptCipher.init(Cipher.ENCRYPT_MODE, secretKey);
@@ -372,159 +251,51 @@ public class EnDecrypt {
         }
 
         /**
-         * <p>Decrypt encrypted {@param inputFilename} to {@param outputFilename} at once</p>
+         * <p>Encrypt {@param bytes}</p>
          *
-         * @param inputFilename that should be decrypted
-         * @param outputFilename to which the decrypted content should be written to
-         * @throws NoSuchPaddingException
-         * @throws NoSuchAlgorithmException
-         * @throws IOException
+         * @param string that should be encrypted
+         *
+         * @see EnDecrypt.AES#encrypt(byte[])
+         *
+         * @since 1.0.0
+         */
+        public String encrypt(String string) throws BadPaddingException, NoSuchAlgorithmException, IllegalBlockSizeException, NoSuchPaddingException, InvalidKeyException, InvalidKeySpecException {
+            return Base64.getEncoder().encodeToString(encrypt(string.getBytes(StandardCharsets.UTF_8)));
+        }
+
+        /**
+         * <p>Decrypt encrypted {@param bytes}</p>
+         *
+         * @param bytes that should be decrypted
+         * @return decrypted bytes
          * @throws BadPaddingException
          * @throws IllegalBlockSizeException
-         * @throws InvalidKeyException
-         * @throws InvalidKeySpecException
-         */
-        public void decryptFileAllInOne(String inputFilename, String outputFilename) throws NoSuchPaddingException, NoSuchAlgorithmException, IOException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptFileAllInOne(Cipher.DECRYPT_MODE, new File(inputFilename), new File(outputFilename));
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param inputBytes} to {@param outputStream} at once</p>
-         *
-         * @param inputBytes that should be decrypted
-         * @param outputStream to which the decrypted content should be written to
          * @throws NoSuchPaddingException
          * @throws NoSuchAlgorithmException
-         * @throws IOException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         * @throws InvalidKeyException
          * @throws InvalidKeySpecException
-         */
-        public void decryptFileAllInOne(byte[] inputBytes, OutputStream outputStream) throws NoSuchPaddingException, NoSuchAlgorithmException, IOException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptFileAllInOne(Cipher.DECRYPT_MODE, inputBytes, outputStream);
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param inputFilename} to {@param outputFilename} line by line</p>
-         *
-         * @see EnDecrypt.AES#decryptFileLineByLine(InputStream, OutputStream, byte[])
-         */
-        public void decryptFileLineByLine(String inputFilename, String outputFilename) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.DECRYPT_MODE, new File(inputFilename), new File(outputFilename), new byte[64]);
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param inputStream} to {@param outputStream} line by line</p>
-         *
-         * @see EnDecrypt.AES#decryptFileLineByLine(InputStream, OutputStream, byte[])
-         */
-        public void decryptFileLineByLine(InputStream inputStream, OutputStream outputStream) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.DECRYPT_MODE, inputStream, outputStream, new byte[64]);
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param inputFilename} to {@param outputFilename} line by line</p>
-         *
-         * @see EnDecrypt.AES#decryptFileLineByLine(InputStream, OutputStream, byte[])
-         */
-        public void decryptFileLineByLine(String inputFilename, String outputFilename, byte[] buffer) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.DECRYPT_MODE, new File(inputFilename), new File(outputFilename), buffer);
-        }
-
-        /**
-         * <p>Decrypt encrypted {@param inputStream} to {@param outputStream} line by line</p>
-         *
-         * @param inputStream that should be decrypted
-         * @param outputStream to which the decrypted content should be written to
-         * @param buffer
-         * @throws NoSuchPaddingException
-         * @throws InvalidAlgorithmParameterException
-         * @throws NoSuchAlgorithmException
-         * @throws IOException
          * @throws InvalidKeyException
-         * @throws InvalidKeySpecException
+         *
+         * @since 1.12.0
          */
-        public void decryptFileLineByLine(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.DECRYPT_MODE, inputStream, outputStream, buffer);
+        public byte[] decrypt(byte[] bytes) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
+            Key secretKey = new SecretKeySpec(createSecretKey(), "AES");
+
+            Cipher decryptCipher = Cipher.getInstance("AES");
+            decryptCipher.init(Cipher.DECRYPT_MODE, secretKey);
+            return decryptCipher.doFinal(Base64.getDecoder().decode(bytes));
         }
 
         /**
-         * <p>DEncrypt {@param inputFilename} to {@param outputFilename} at once</p>
+         * <p>Decrypt encrypted {@param string}</p>
          *
-         * @param inputFilename that should be encrypt
-         * @param outputFilename to which the encrypted content should be written to
-         * @throws NoSuchPaddingException
-         * @throws NoSuchAlgorithmException
-         * @throws IOException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         * @throws InvalidKeyException
-         * @throws InvalidKeySpecException
-         */
-        public void encryptFileAllInOne(String inputFilename, String outputFilename) throws NoSuchPaddingException, NoSuchAlgorithmException, IOException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptFileAllInOne(Cipher.ENCRYPT_MODE, new File(inputFilename), new File(outputFilename));
-        }
-
-        /**
-         * <p>Encrypt {@param inputBytes} to {@param outputStream} at once</p>
+         * @param string that should be decrypted
          *
-         * @param inputBytes that should be encrypted
-         * @param outputStream to which the encrypted content should be written to
-         * @throws NoSuchPaddingException
-         * @throws NoSuchAlgorithmException
-         * @throws IOException
-         * @throws BadPaddingException
-         * @throws IllegalBlockSizeException
-         * @throws InvalidKeyException
-         * @throws InvalidKeySpecException
-         */
-        public void encryptFileAllInOne(byte[] inputBytes, OutputStream outputStream) throws NoSuchPaddingException, NoSuchAlgorithmException, IOException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptFileAllInOne(Cipher.ENCRYPT_MODE, inputBytes, outputStream);
-        }
-
-        /**
-         * <p>Encrypt {@param inputFilename} to {@param outputFilename} line by line</p>
+         * @see EnDecrypt.AES#decrypt(byte[])
          *
-         * @see EnDecrypt.AES#encryptFileLineByLine(InputStream, OutputStream, byte[])
+         * @since 1.0.0
          */
-        public void encryptFileLineByLine(String inputFilename, String outputFilename) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.ENCRYPT_MODE, new File(inputFilename), new File(outputFilename), new byte[64]);
-        }
-
-        /**
-         * <p>Encrypt {@param inputStream} to {@param outputStream} line by line</p>
-         *
-         * @see EnDecrypt.AES#encryptFileLineByLine(InputStream, OutputStream, byte[])
-         */
-        public void encryptFileLineByLine(InputStream inputStream, OutputStream outputStream) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.ENCRYPT_MODE, inputStream, outputStream, new byte[64]);
-        }
-
-        /**
-         * <p>Encrypt {@param inputFilename} to {@param outputFilename} line by line</p>
-         *
-         * @see EnDecrypt.AES#encryptFileLineByLine(InputStream, OutputStream, byte[])
-         */
-        public void encryptFileLineByLine(String inputFilename, String outputFilename, byte[] buffer) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.ENCRYPT_MODE, new File(inputFilename), new File(outputFilename), buffer);
-        }
-
-        /**
-         * <p>Encrypt {@param inputStream} to {@param outputStream} line by line</p>
-         *
-         * @param inputStream that should be encrypted
-         * @param outputStream to which the encrypted {@param inputStream} should be written to
-         * @param buffer
-         * @throws NoSuchPaddingException
-         * @throws InvalidAlgorithmParameterException
-         * @throws NoSuchAlgorithmException
-         * @throws IOException
-         * @throws InvalidKeyException
-         * @throws InvalidKeySpecException
-         */
-        public void encryptFileLineByLine(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IOException, InvalidKeyException, InvalidKeySpecException {
-            enDecryptLineByLine(Cipher.ENCRYPT_MODE, inputStream, outputStream, buffer);
+        public String decrypt(String string) throws BadPaddingException, NoSuchAlgorithmException, IllegalBlockSizeException, NoSuchPaddingException, InvalidKeyException, InvalidKeySpecException {
+            return new String(decrypt(string.getBytes(StandardCharsets.UTF_8)), StandardCharsets.UTF_8);
         }
 
     }