[filmor]

- TOFU: Trust on first use (https://en.m.wikipedia.org/wiki/Trust_on_first_use)

- SSHFP: SSH FingerPrint record in the domain name system (https://en.m.wikipedia.org/wiki/SSHFP_record)

- MITM: Man in the middle (https://en.m.wikipedia.org/wiki/Man-in-the-middle_attack)

[mathfailure]

You missed some.

- SSH: Secure SHell (https://en.wikipedia.org/wiki/Secure_Shell)

- PKI: Public Key Infrastructure (https://en.wikipedia.org/wiki/Public_key_infrastructure)

- US: United States (https://en.wikipedia.org/wiki/United_States)