doc/overview.texi

   1 @node Overview
   2 @unnumbered Overview
   3
   4 GoVPN is simple secure virtual private network daemon, written entirely
   5 on @url{http://golang.org/, Go programming language}.
   6
   7 Reviewability, high 128-bit security margin and
   8 @url{https://en.wikipedia.org/wiki/Deep_packet_inspection, DPI}
   9 censorship resistance in mind in free software solution are the main
  10 goals for that daemon. Most modern widespread protocols and their
  11 implementations in software are too complex to be reviewed, analyzed and
  12 modified.
  13
  14 State off art cryptography technologies includes:
  15 @url{http://cr.yp.to/snuffle.html, Salsa20} stream encryption,
  16 @url{http://143.53.36.235:8080/tea.htm, XTEA} PRP,
  17 @url{http://cr.yp.to/mac.html, Poly1305} message authentication,
  18 @url{https://en.wikipedia.org/wiki/PBKDF2} password-based key derivation
  19 function based on @url{https://en.wikipedia.org/wiki/SHA-2, SHA-512}
  20 hash function,
  21 @url{https://en.wikipedia.org/wiki/Encrypted_key_exchange,
  22 Diffie-Hellman Augmented Encrypted Key Exchange}
  23 (DH-A-EKE) powered by @url{http://cr.yp.to/ecdh.html, Curve25519} and
  24 @url{http://ed25519.cr.yp.to/, Ed25519} signatures.
  25 Strong
  26 @url{https://en.wikipedia.org/wiki/Zero-knowledge_password_proof, zero-knowledge}
  27 mutual authentication with key exchange stage is invulnerable
  28 to man-in-the-middle attacks.
  29 @url{https://en.wikipedia.org/wiki/Forward_secrecy, Perfect forward secrecy}
  30 property guarantee that compromising of long-term authentication
  31 pre-shared key can not lead to previously captured traffic decrypting.
  32 Compromising of peers password file on server side won't allow attacker
  33 to masquerade as the client, because of asymmetric @strong{verifiers}
  34 usage, resistant to dictionary attacks. Rehandshaking ensures session
  35 keys rotation. MAC authentication with one-time keys protects against
  36 @url{https://en.wikipedia.org/wiki/Replay_attack, replay attacks}.
  37
  38 Server can work with several clients simultaneously. Each client is
  39 @strong{identified} by 128-bit key, that does not leak during handshake
  40 and each client stays @strong{anonymous} for MiTM and DPI. All settings
  41 are applied per-peer separately.
  42
  43 Optional ability to hide payload packets lengths by appending
  44 @strong{noise} to them during transmission. Ability to generate constant
  45 packet rate traffic (@strong{CPR}) that will hide even the fact of
  46 packets appearance, their timestamps.
  47
  48 The only platform specific requirement is TAP network interface support.
  49 API to that kind of device is different, OS dependent and non portable.
  50 So only a few operating systems is officially supported. Author has no
  51 proprietary software to work with, so currently there is lack of either
  52 popular Microsoft Windows or Apple OS X support.
  53
  54 @itemize @bullet
  55 @item
  56 Copylefted free software: licensed under
  57 @url{https://www.gnu.org/licenses/gpl-3.0.html, GPLv3+}
  58 @item
  59 Works with @url{https://en.wikipedia.org/wiki/TAP_(network_driver), TAP}
  60 network interfaces on top of UDP entirely
  61 @item
  62 @url{https://www.gnu.org/, GNU}/Linux and
  63 @url{http://www.freebsd.org/, FreeBSD} support
  64 @item IPv6 compatible
  65 @item Encrypted and authenticated payload transport
  66 @item Relatively fast handshake
  67 @item Password-authenticated key exchange
  68 @item Server-side password verifiers are secure against dictionary attacks
  69 @item Attacker can not masquerade a client even with password files compromising
  70 @item Replay attack protection
  71 @item Perfect forward secrecy property
  72 @item Mutual two-side authentication
  73 @item Zero knowledge authentication
  74 @item Built-in rehandshake and heartbeat features
  75 @item Several simultaneous clients support
  76 @item Per-client configuration options
  77 @item Hiding of payload packets length with noise
  78 @item Hiding of payload packets timestamps with constant packet rate traffic
  79 @item Optional built-in HTTP-server for retrieving information about
  80 known connected peers in @url{http://json.org/, JSON} format
  81 @end itemize