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So What Is XChaCha20?

So what’s the encryption that is being used to secure this article? Well, that’s easy, we can just connect to medium.com with OpenSSL:

% openssl s_client  -connect medium.com:443  
CONNECTED(00000005)
depth=2 C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root
verify return:1
depth=1 C = US, O = "Cloudflare, Inc.", CN = Cloudflare Inc ECC CA-3
verify return:1
depth=0 C = US, ST = California, L = San…