Compiling-asn1-specifications.md

@@ -61,6 +61,9 @@ Here are some other available useful ressources:
   ASN.1 message converter and editor which supports many encoding rules too.
 - ITU-T has a complete web page referencing tools and softwares supporting ASN.1
   at the [ITU-T ASN.1 tools](http://www.itu.int/en/ITU-T/asn1/Pages/Tools.aspx).
+- A very complete [webpage at zytrax](https://www.zytrax.com/tech/survival/asn1.html)
+  explaining the ASN.1 syntax in its entirety, the DER encoding, and how it is used 
+  for certificate encoding
 
 
 ## Support in pycrate