+@cindex About
+@cindex Description
+@cindex Introduction
+
GoVPN is simple free software virtual private network daemon,
aimed to be reviewable, secure and
@url{https://en.wikipedia.org/wiki/Deep_packet_inspection, DPI}/censorship-resistant.
-@itemize @bullet
+@itemize
+
@item
Copylefted free software: licenced under
@url{https://www.gnu.org/licenses/gpl-3.0.html, GPLv3+}.
+
@item
Fast strong @ref{PAKE, passphrase authenticated} augmented
@ref{Handshake, key agreement protocol} with zero-knowledge mutual peers
authentication (PAKE DH A-EKE (Diffie-Hellman Augmented Encrypted Key
-Exchange)), censorship resistant (indistinguishable from noise, with
-hidden packet's length).
+Exchange)).
+
@item
@ref{Verifier structure, Augmented authentication tokens} resistant to
-offline dictionary attacks. An attacker can not masquerade a client
-even with server passphrase verifiers compromising.
+offline dictionary attacks. They use CPU and memory hardened hashing
+algorithm. An attacker can not masquerade a client even with server
+passphrase verifiers compromising.
+
@item
Encrypted and authenticated @ref{Transport, payload transport}
with 128-bit @ref{Developer, security margin} state-of-the-art
-cryptography and censorship resistance (indistinguishability from noise
-and hiding of packet's length).
+cryptography.
+
+@item
+Optional @ref{Encless, encryptionless mode} of operation: no encryption
+functions are applied for outgoing traffic, but still confidentiality
+preserving encoding. Jurisdictions and courts can not either force you
+to reveal encryption keys or sue for encryption usage.
+
+@item
+Censorship resistant handshake and transport messages: fully
+indistinguishable from the noise with optionally hidden packets length.
+
@item
@url{https://en.wikipedia.org/wiki/Forward_secrecy, Perfect forward secrecy}
property.
+
@item
Replay attack protection (using one-time MACs).
+
@item
Built-in rehandshake (session key rotation) and heartbeat features.
+
@item
Ability to hide packets length with the @ref{Noise, noise} data.
+
@item
Ability to hide payload timestamps with @ref{CPR, constant packet rate}
traffic.
+
@item
Compatible with @url{http://egd.sourceforge.net/, EGD} (entropy
gathering daemon) PRNGs.
+
@item
Several simultaneous clients support with per-client configuration
options. Clients have pre-established @ref{Identity, identity} invisible
for third-parties (they are anonymous).
+
@item
Uses @url{https://en.wikipedia.org/wiki/TAP_(network_driver), TAP}
underlying network interfaces.
+
@item
Can use @ref{Network, UDP and TCP} or HTTP @ref{Proxy, proxies}
for accessing the server.
+
@item
Fully IPv4 and IPv6 compatible.
+
@item
Optional built-in HTTP-server for retrieving real-time
@ref{Stats, statistics} information about known connected peers in
@url{http://json.org/, JSON} format.
+
+@item
+Server is configured through the @url{http://yaml.org/, YAML} file.
+
@item
-Written on @url{http://golang.org/, Go} programming language with
+Written on @url{https://golang.org/, Go} programming language with
simple code that can be read and reviewed.
+
@item
@url{https://www.gnu.org/, GNU}/Linux and
-@url{http://www.freebsd.org/, FreeBSD} support.
+@url{https://www.freebsd.org/, FreeBSD} support.
+
@end itemize