TermBot is an SSH client that supports authentication with YubiKeys, Nitrokeys and other OpenPGP cards over NFC and USB. For this it uses the COTECH Hardware Security SDK available at. Supported hardware: NFC: Cotech Card. YubiKey NEO. YubiKey 5 NFC. USB: Nitrokey Start, Pro, Storage (with adapter). YubiKey 4, 4 Nano, 5, 5 Nano (with adapter).