Unit test showing automatically encrypted property

CredentialTest.cs

using MbUnit.Framework;

namespace DataAccessTests {
    [TestFixture]
    public class CredentialTest
    {
        [Test]
        public void TestPasswordIsEncrypted() {
            var cr = new DataAccess.DTO.Credential();
            cr.Password = "Password1!";
            Assert.AreNotEqual("Password1!", cr.Password);
        }

        [Test]
        public void TestPasswordDecryption() {
            var cr = new DataAccess.DTO.Credential();
            cr.Password = "Password1!";
            Assert.AreEqual("Password1!", ((DataAccess.Aspects.IEncrypted)cr).AsClear("Password"));
        }
    }
}