Editing IPsec (section)

==History==
Starting in the early 1970s, the [[DARPA|Advanced Research Projects Agency]] sponsored a series of experimental [[ARPANET encryption devices]], at first for native [[ARPANET]] packet encryption and subsequently for [[TCP/IP]] packet encryption; some of these were certified and fielded. From 1986 to 1991, the [[NSA]] sponsored the development of security protocols for the Internet under its Secure Data Network Systems (SDNS) program.<ref>{{Cite book|publisher=[[IEEE]] |chapter-url=https://ieeexplore.ieee.org/document/6168355 |language=en-US|doi=10.1109/ACCT.2012.64|s2cid=16526652|year=2012 |last1=Dhall |first1=Hitesh |last2=Dhall |first2=Dolly |last3=Batra |first3=Sonia |last4=Rani |first4=Pooja |title=2012 Second International Conference on Advanced Computing & Communication Technologies |chapter=Implementation of IPSec Protocol |pages=176–181 |isbn=978-1-4673-0471-9 }}</ref> This brought together various vendors including [[Motorola]] who produced a network encryption device in 1988. The work was openly published from about 1988 by [[National Institute of Standards and Technology|NIST]] and, of these, ''Security Protocol at Layer 3'' (SP3) would eventually morph into the ISO standard Network Layer Security Protocol (NLSP).<ref>{{Cite web |url=http://www.toad.com/gnu/netcrypt.html |title=Network Encryption – history and patents |first=John |last=Gilmore |access-date=2014-02-18 |archive-url=https://web.archive.org/web/20140903145752/http://www.toad.com/gnu/netcrypt.html |archive-date=2014-09-03 |url-status=dead }}</ref>

In 1992, the US [[Naval Research Laboratory]] (NRL) was funded by DARPA CSTO to implement IPv6 and to research and implement IP encryption in 4.4 [[BSD]], supporting both SPARC and x86 CPU architectures. DARPA made its implementation freely available via MIT.  Under NRL's [[DARPA]]-funded research effort, NRL developed the [[IETF]] standards-track specifications (RFC 1825 through RFC 1827) for IPsec.<ref name="MIT"/>  NRL's IPsec implementation was described in their paper in the 1996 [[USENIX Conference]] Proceedings.<ref>{{Cite web|url=https://www.usenix.org/legacy/publications/library/proceedings/sd96/atkinson.html|title=USENIX 1996 ANNUAL TECHNICAL CONFERENCE|website=www.usenix.org}}</ref>  NRL's open-source IPsec implementation was made available online by [[MIT]] and became the basis for most initial commercial implementations.<ref name="MIT">{{Cite web|url=https://web.mit.edu/network/isakmp/|title=IPv6 + IPSEC + ISAKMP Distribution Page|website=web.mit.edu}}</ref>

The [[Internet Engineering Task Force]] (IETF) formed the IP Security Working Group in 1992<ref>{{Cite web|url=https://datatracker.ietf.org/wg/ipsec/history/|title=IP Security Protocol (ipsec) -|website=datatracker.ietf.org}}</ref> to standardize openly specified security extensions to IP, called ''IPsec''.{{Ref RFC|4301|p=4|quote=The spelling "IPsec" is preferred and used throughout this and all related IPsec standards.  All other capitalizations of IPsec [...] are deprecated.}} The NRL developed standards were published by the IETF as RFC 1825 through RFC 1827.<ref>{{Cite web|url=https://www.nrl.navy.mil/itd/sites/www.nrl.navy.mil.itd/files/files/itd_accomp_ipsec.pdf |archive-url=https://web.archive.org/web/20150915230737/http://www.nrl.navy.mil/itd/sites/www.nrl.navy.mil.itd/files/files/itd_accomp_ipsec.pdf |archive-date=2015-09-15 |url-status=dead|title=NRL ITD Accomplishments - IPSec and IPv6|website=US Naval Research Laboratories}}</ref>