diff --git a/src/main/java/com/security/arithmetic/CryptoHelper.java b/src/main/java/com/security/arithmetic/CryptoHelper.java
index de8ae56d..4d16f02b 100644
--- a/src/main/java/com/security/arithmetic/CryptoHelper.java
+++ b/src/main/java/com/security/arithmetic/CryptoHelper.java
@@ -116,6 +116,45 @@ public class CryptoHelper {
         return cipher.doFinal(ciphertext);
     }
 
+    /**
+     * Aes 256 encryption byte [ ].
+     *
+     * @param plaintext the plaintext
+     * @param aesKey    the aes key
+     * @return the byte [ ]
+     * @throws NoSuchAlgorithmException  the no such algorithm exception
+     * @throws NoSuchPaddingException    the no such padding exception
+     * @throws InvalidKeyException       the invalid key exception
+     * @throws BadPaddingException       the bad padding exception
+     * @throws IllegalBlockSizeException the illegal block size exception
+     */
+    public static byte[] aes256Encryption(byte[] plaintext, String aesKey) throws NoSuchAlgorithmException,
+        NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
+        Cipher cipher = Cipher.getInstance(AES_ALGORITHM_STR);
+        SecretKeySpec key = new SecretKeySpec(sha256Encryption(aesKey), "AES");
+        cipher.init(Cipher.ENCRYPT_MODE, key);
+        return cipher.doFinal(plaintext);
+    }
+
+    /**
+     * Aes 256 decryption byte [ ].
+     *
+     * @param ciphertext the ciphertext
+     * @param aesKey     the aes key
+     * @return the byte [ ]
+     * @throws NoSuchAlgorithmException  the no such algorithm exception
+     * @throws NoSuchPaddingException    the no such padding exception
+     * @throws InvalidKeyException       the invalid key exception
+     * @throws BadPaddingException       the bad padding exception
+     * @throws IllegalBlockSizeException the illegal block size exception
+     */
+    public static byte[] aes256Decryption(byte[] ciphertext, String aesKey) throws NoSuchAlgorithmException,
+        NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
+        Cipher cipher = Cipher.getInstance(AES_ALGORITHM_STR);
+        SecretKeySpec key = new SecretKeySpec(sha256Encryption(aesKey), "AES");
+        cipher.init(Cipher.DECRYPT_MODE, key);
+        return cipher.doFinal(ciphertext);
+    }
 
     /**
      * Des decryption byte [ ].
diff --git a/src/test/java/com/dispose/test/dev/function/CryptoHelperTest.java b/src/test/java/com/dispose/test/dev/function/CryptoHelperTest.java
index 09386918..fa8db32b 100644
--- a/src/test/java/com/dispose/test/dev/function/CryptoHelperTest.java
+++ b/src/test/java/com/dispose/test/dev/function/CryptoHelperTest.java
@@ -65,7 +65,7 @@ public class CryptoHelperTest {
      * @throws InvalidKeyException       the invalid key exception
      */
     @Test
-    public void t2_desTest() throws NoSuchPaddingException, NoSuchAlgorithmException, IllegalBlockSizeException,
+    public void t3_desTest() throws NoSuchPaddingException, NoSuchAlgorithmException, IllegalBlockSizeException,
         BadPaddingException, InvalidKeyException {
         String srcTest = "hello word";
         String key = "hkoUV5ZWh0q1jSxMnpjovVn19Qg99HY6DD40";
@@ -77,4 +77,19 @@ public class CryptoHelperTest {
         byte[] aesDecode = CryptoHelper.desDecryption(aesCode, key);
         Assert.assertEquals(new String(aesDecode), srcTest);
     }
+
+    @Test
+    public void t4_aes256Test() throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException,
+        NoSuchAlgorithmException, NoSuchPaddingException {
+        String srcTest = "hello word";
+        String key = "hkoUV5ZWh0q1jSxMnpjovVn19Qg99HY6DD40";
+        byte[] aesCode = CryptoHelper.aes256Encryption(srcTest.getBytes(StandardCharsets.UTF_8), key);
+        String showText = CryptoHelper.base64Encryption(aesCode);
+
+
+        Assert.assertEquals(showText, "3sTXo4P2/pGQEfL9UJ/wRQ==");
+
+        byte[] aesDecode = CryptoHelper.aes256Decryption(aesCode, key);
+        Assert.assertEquals(new String(aesDecode), srcTest);
+    }
 }