Editing Transport Layer Security (section)

====Secure Data Network System====
{{Anchor|DNS}}
In August 1986, the National Security Agency, the National Bureau of Standards, the Defense Communications Agency launched a project, called the Secure Data Network System (SDNS), with the intent of designing the next generation of secure computer communications network and product specifications to be implemented for applications on public and private internets. It was intended to complement the rapidly emerging new OSI internet standards moving forward both in the U.S. government's GOSIP Profiles and in the huge ITU-ISO JTC1 internet effort internationally.<ref>{{cite web|url=https://www.circleid.com/posts/20190124_creating_tls_the_pioneering_role_of_ruth_nelson|title=Creating TLS: The Pioneering Role of Ruth Nelson|access-date=2020-07-04|archive-date=2020-06-24|archive-url=https://web.archive.org/web/20200624123447/http://www.circleid.com/posts/20190124_creating_tls_the_pioneering_role_of_ruth_nelson/|url-status=live}}</ref>

As part of the project, researchers designed a protocol called SP4 (''security protocol'' in layer 4 of the OSI system). This was later renamed the Transport Layer Security Protocol (TLSP) and subsequently published in 1995 as international standard ITU-T X.274|ISO/IEC 10736:1995.<ref>{{cite web|url=https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.274-199407-I!!PDF-E&type=items|title=Information technology – Telecommunication and information exchange between systems – Transport layer security protocol|access-date=2025-05-03|archive-date=2025-05-03|archive-url=https://web.archive.org/web/20250503170309/https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.274-199407-I!!PDF-E&type=items|url-status=live}}</ref> Despite the name similarity, this is distinct from today's TLS.