Integracion_DGA/DAL/Encriptador.cs

using System.Security.Cryptography;
using System.Text;

namespace DAL
{
    public static class Encriptador
    {
        private static readonly byte[] key = Encoding.ASCII.GetBytes("1234567891234567");
        private static readonly byte[] iv = Encoding.ASCII.GetBytes("Devjoker7.37hAES");

        public static string Encripta(string Cadena)
        {

            using Aes aesAlg = Aes.Create();
            aesAlg.Key = key;
            aesAlg.IV = iv;

            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        swEncrypt.Write(Cadena);
                    }
                }

                return Convert.ToBase64String(msEncrypt.ToArray());
            }
        }

        public static string Desencripta(string Cadena)
        {
            using Aes aesAlg = Aes.Create();
            aesAlg.Key = key;
            aesAlg.IV = iv;

            ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

            using (MemoryStream msDecrypt = new MemoryStream(Convert.FromBase64String(Cadena)))
            {
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                    {
                        return srDecrypt.ReadToEnd();
                    }
                }
            }
        }
    }
}