ASN.1 is also rather complex and the most widely used encoding rules have been shown many times to be rather difficult to implement correctly and securely [1].

ASN.1 is also rather complex and the most widely used encoding rules have been shown many times to be rather difficult to implement correctly and securely [1]. X.696 (OER) is said to be better, but it is only around since a few years (!). [1] A property shared by many IT industry standards.