Ревью: шифрование и токены на Java

public class CryptoUtil {
    private static final byte[] KEY = "0123456789abcdef".getBytes();
    private static final byte[] IV = new byte[16];

    public static byte[] encrypt(byte[] data) throws Exception {
        Cipher c = Cipher.getInstance("AES/ECB/PKCS5Padding");
        c.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(KEY, "AES"));
        return c.doFinal(data);
    }

    public static String hashPassword(String pw) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        return HexFormat.of().formatHex(md.digest(pw.getBytes()));
    }

    public static String resetToken() {
        return Long.toHexString(new Random().nextLong());
    }
}