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The majority of electronic communication today happens either via email orchat. Thanks to the use of standardised protocols electronic mail (SMTP, IMAP,POP3) and instant chat (XMPP, IRC) servers can be deployed in a decentralisedbut interoperable fashion. These protocols can be secured by providingencryption with the use of TLS---directly or via the STARTTLS extension---andleverage X.509 PKIs or ad hoc methods to authenticate communication peers.However, many combination of these mechanisms lead to insecure deployments.  We present the largest study to date that investigates the security of theemail and chat infrastructures. We used active Internet-wide scans to determinethe amount of secure service deployments, and passive monitoring to investigateif user agents actually use this opportunity to secure their communications. Weaddressed both the client-to-server interactions as well as server-to-serverforwarding mechanisms that these protocols offer, and the use of encryption andauthentication methods in the process.  Our findings shed light on an insofar unexplored area of the Internet. Thetruly frightening result is that most of our communication is poorly secured intransit.

TLS in the wild: an Internet-wide analysis of TLS-based protocols for electronic communication