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Transport Layer Security (TLS), the successor of Secure Socket Layer (SSL), is the mechanism through which encrypted connections can be established between clients and servers on the web and through which data can flow with integrity intact.

Simplified, TLS is made possible by using a Public Key Infrastructure (PKI) involving private cryptographic keys, certificates of ownership (public, signed with private key) and certificate authorities (CAs, issuing and asserting the validity of issued certificates).

The entire system is dependent on the functioning operation of the CAs, that the cryptographic keys they use to sign certificates of ownership to site/domain owners are kept secret. It is also dependent on the site/domain owners' ability to keep their private cryptographic key secret.

If they fail to do so, they have to report this to the CA that issued the certificate so that the CA can revoke it, and by doing so letting browsers and other clients know of the changes through the Online Certificate Status Protocol (OCSP).

TLS in k6

By default and without any special configuration k6 will connect and talk to servers over TLS - You just need to make sure that your request URLs are specified with the https scheme.

The following TLS functionality supported by k6 is worth talking about in more detail: