GoVPN is simple secure free software virtual private network daemon,
aimed to be reviewable, secure, DPI/censorship-resistant, written on Go.

It uses fast strong passphrase authenticated key agreement protocol with
augmented zero-knowledge mutual peers authentication (PAKE DH A-EKE).
Encrypted, authenticated data transport that hides message's length and
timestamps. Optional encryptionless mode, that still preserves data
confidentiality. Perfect forward secrecy property. Resistance to:
offline dictionary attacks, replay attacks, client's passphrases
compromising and dictionary attacks on the server side. Built-in
heartbeating, rehandshaking, real-time statistics. Ability to work
through UDP, TCP and HTTP proxies. IPv4/IPv6-compatibility.

WWW: http://www.cypherpunks.ru/govpn/