These demonstrate technical skills in the area of work. Specialising in the security aspects of information technology and protocols such as DNS, SPF, DKIM, DMARC, SSL/TLS, SMTP, IMAP, XMPP, authentication and cryptographic technologies.
The history of email is a particularly engrossing read.
Documents by David on various topics
These of historical interest written by David.
Documents that are linked in content on the web site.
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