RFC 7435 · INFORMATIONAL · 2014
SUN · 14 JUN 2026
Opportunistic Security: Some Protection Most of the Time
Overview
RFC 7435, “Opportunistic Security: Some Protection Most of the Time”, is an Informational document published in December 2014 by V. Dukhovni. The canonical text is published by the RFC Editor.
Abstract
This document defines the concept "Opportunistic Security" in the context of communications protocols. Protocol designs based on Opportunistic Security use encryption even when authentication is not available, and use authentication when possible, thereby removing barriers to the widespread use of encryption on the Internet.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 7435 is hosted at rfc-editor.org. Available in TXT,HTML.
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