<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Encryption and Authentication</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Linux IPv6 HOWTO (en)" HREF="index.html"><LINK REL="PREVIOUS" TITLE="IPv6 security auditing" HREF="ipv6-security-auditing.html"><LINK REL="NEXT" TITLE="Modes of using encryption and authentication" HREF="x2360.html"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Linux IPv6 HOWTO (en)</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="ipv6-security-auditing.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="x2360.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="CHAPTER-ENCRYPTION-AUTHENTICATION" ></A >Chapter 19. Encryption and Authentication</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >19.1. <A HREF="x2360.html" >Modes of using encryption and authentication</A ></DT ><DD ><DL ><DT >19.1.1. <A HREF="x2360.html#AEN2363" >Transport mode</A ></DT ><DT >19.1.2. <A HREF="x2360.html#AEN2367" >Tunnel mode</A ></DT ></DL ></DD ><DT >19.2. <A HREF="x2371.html" >Support in kernel (ESP and AH)</A ></DT ><DD ><DL ><DT >19.2.1. <A HREF="x2371.html#AEN2373" >Support in vanilla Linux kernel 2.4.x</A ></DT ><DT >19.2.2. <A HREF="x2371.html#AEN2377" >Support in vanilla Linux kernel 2.6.x</A ></DT ></DL ></DD ><DT >19.3. <A HREF="x2381.html" >Automatic key exchange (IKE)</A ></DT ><DD ><DL ><DT >19.3.1. <A HREF="x2381.html#AEN2386" >IKE daemon “racoon”</A ></DT ><DT >19.3.2. <A HREF="x2381.html#AEN2420" >IKE daemon “pluto”</A ></DT ></DL ></DD ><DT >19.4. <A HREF="x2443.html" >Additional informations:</A ></DT ></DL ></DIV ><P >Unlike in IPv4, encryption and authentication is a mandatory feature of IPv6. Those features are normally implemented using IPsec (which can be also used by IPv4).</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="ipv6-security-auditing.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="x2360.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >IPv6 security auditing</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Modes of using encryption and authentication</TD ></TR ></TABLE ></DIV ></BODY ></HTML >