At Thu,  8 Jul 2004 11:56:10 -0700 (PDT), xxxxxx@pobox.com wrote:
>
> The best guide on BER/DER and ASN.1 is
> 	Burton S. Kaliski Jr. A Layman's Guide to a Subset of ASN.1, BER,
> and DER. An RSA Laboratories Technical Note. Revised November 1, 1993.

Thanks, this is much better than the other explanations I found, I'll
add it to the references.

--
Alex