<reference anchor="RFC1108" target="https://www.rfc-editor.org/info/rfc1108"> <front> <title>U.S. Department of Defense Security Options for the Internet Protocol</title> <author fullname="S. Kent" initials="S." surname="Kent"/> <date month="November" year="1991"/> <abstract> <t>This RFC specifies the U.S. Department of Defense Basic Security Option and the top-level description of the Extended Security Option for use with the Internet Protocol. This RFC obsoletes RFC 1038, "Revised IP Security Option", dated January 1988. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="1108"/> <seriesInfo name="DOI" value="10.17487/RFC1108"/> </reference>