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I was curious about HTTPSec when I saw the link at the bottom of the HTTP Strict Transport Security article. But I thought it was strange that the HTTPSec article didn't have any links to its RFC, or other articles about it. The biggest hits for it on Google are the Wikipedia article, and this slideshow which is actually about DNSSec and a fictional (unrelated to this one) protocol called HTTPSec. There are also some old documents about an IETF discussion group called "HTTPSEC" in 1994, but it doesn't look like they had anything to do with the protocol described in this article, which was developed several years later by a company called Secarta. There is also no RFC for this protocol.
Neither Secarta's website nor the HTTPSec main website are still online, but they can be found in the Internet Time Machine. From that, it looks like the main httpsec.org website has been down since 2011. And the HTTPsec protocol was just an idea by Secarta, published on their own website. It doesn't seem to have been adopted by anyone else, and the only implementation of it is their demonstration Java program. So I think this is probably a non-notable topic. Or at least, it should be updated to indicate that this proposal is vaporware from a defunct organization. --2404:130:0:1000:7523:F90C:7789:8935 (talk) 06:12, 11 August 2016 (UTC)