โTKey is a new type of flexible USB security token. (...) Each TKey device contains a Unique Device Secret (UDS), which together with the application measurement, and an optional user-provided seed, is used to derive key material unique to each application. (...) This allows for open-ended, flexible usage. Given the right application, the TKey can support use cases such as SSH login, Ed25519 signing, Root of Trust, FIDO2, Passkeys, TOTP, and more.โ