http://tcllib.sourceforge.net/doc/asn.html
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"Abstract Syntax Notation" in ITU-T X.680
[http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf];
also note related language specifications
[http://www.itu.int/ITU-T/studygroups/com17/languages/].
These are all reference materials, largely opaque to humans; we need
to mention here also such tutorials as Milan and Dubuisson's
[http://asn1.elibel.tm.fr/en/tools/tutorial/] and Kaliski's ".. Layman's Guide ..."
[http://luca.ntop.org/Teaching/Appunti/asn1.html]. 

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[X.509v3 Certificate Viewer example] based on the tcllib asn package
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ASN.1 is commonly used in the following applications

   * Cryptography related file formats (X509 certificates, PKCS#7 messages) etc
   * ldap

There is [tcllib] [asn package] which is able to parse almost all ASN objects.

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