Further, schemes can be set up so the fob never divulges its private keys to anyone, just answers challenges to prove it knows them. The same fob can be used for many purposes. It is designed to destruct rather than divulge its private keys.
Thumbdrives can hold 64+ megabytes of additional information, and can be used for securely transferring information from one place to another.
Other sorts of digital id are based on scanning fingerprints or the iris of the eye, but they are obviously much more expensive technology.
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