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It took that long for someone with the skill and interest to get annoyed by the status quo, and sit down and develop a bare-bones protocol that does just what is needed.

Cryptographic knowledge is much more available today than it was 17 years ago when OpenVPN started, so that has probably helped. Some of the constructs used in Wireguard (such as ChaCha20Poly1305) are also quite recent, and didn't exist when OpenVPN started.




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