3 ms·

What you're describing is called a smartcard, and readily available on the market. I keep my PGP key on one.

• hollerith 12y ago
  Does your PGP key stay on the smartcard or is a copy of it transferred to your computer on occasion?
  • Nursie 12y ago
    If it's a properly designed smartcard system then the key never leaves the card.
  • nathan7 12y ago
    The key can be generated on the smartcard, and it's not possible to transfer it out of the smartcard by design. (anything that calls itself a smartcard but allows this isn't a smartcard)