Transport Layer Security (TLS)
The protocol that encrypts data in transit and authenticates the server - the layer every API call and stream rides on.
TLS is the protocol that protects data moving across a network. Each session begins with a handshake in which the parties authenticate the server's certificate and agree on keys, after which everything is encrypted and integrity-protected. TLS 1.3 removed the older, weaker options and cut the handshake to a single round trip, which matters for anything sensitive to round-trip time.
What TLS protects is the traffic, not the caller: it establishes that you are talking to the right server over a private channel, while an API key establishes who you are. And confidentiality today is not confidentiality forever - a session recorded now can be decrypted whenever the underlying mathematics gives way, which is the reasoning behind hybrid key exchange and the harvest now, decrypt later threat it answers.
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