Java에서 3DES를 사용하여 성공적인 암호화 및 암호 해독을 보장하는 방법은 무엇입니까?

public static void main(String[] args) throws Exception {
    String text = "kyle boon";

    byte[] codedtext = new TripleDESTest().encrypt(text);
    String decodedtext = new TripleDESTest().decrypt(codedtext);

    System.out.println(decodedtext); // Prints "kyle boon"
}

public byte[] encrypt(String message) throws Exception {
    // Generate key bytes using MD5 digest
    MessageDigest md = MessageDigest.getInstance("md5");
    byte[] digestOfPassword = md.digest("HG58YZ3CR9".getBytes("utf-8"));
    byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
    for (int j = 0, k = 16; j < 8;) {
        keyBytes[k++] = keyBytes[j++];
    }

    // Create SecretKey and IvParameterSpec
    SecretKey key = new SecretKeySpec(keyBytes, "DESede");
    IvParameterSpec iv = new IvParameterSpec(new byte[8]);

    // Initialize Cipher object
    Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, key, iv);

    // Encrypt plain text
    byte[] plainTextBytes = message.getBytes("utf-8");
    return cipher.doFinal(plainTextBytes);
}

public String decrypt(byte[] message) throws Exception {
    // Generate key bytes using MD5 digest
    MessageDigest md = MessageDigest.getInstance("md5");
    byte[] digestOfPassword = md.digest("HG58YZ3CR9".getBytes("utf-8"));
    byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
    for (int j = 0, k = 16; j < 8;) {
        keyBytes[k++] = keyBytes[j++];
    }

    // Create SecretKey and IvParameterSpec
    SecretKey key = new SecretKeySpec(keyBytes, "DESede");
    IvParameterSpec iv = new IvParameterSpec(new byte[8]);

    // Initialize Cipher object
    Cipher decipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
    decipher.init(Cipher.DECRYPT_MODE, key, iv);

    // Decrypt cipher text
    return new String(decipher.doFinal(message), "UTF-8");
}