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After the initial key negotiation, re-keying is performed every 60 minutes (this value can be lowered unilaterally by the client) Additional connection types, supported by every Air VPN server, for ISPs or countries disrupting OpenVPN, are OpenVPN over SSH, SSL or Tor Stay protected with the security offered by very strong encryption, 4096 bit DH and RSA keys size, AES-256-GCM or CHACHA20-POLY1305 encryption cipher.