> How do they work? A (very) small display to show the hash that's being signed and an integrated PINpad. PC sends data to the smartcard unit for signing, then signals the SC unit "okay, I'm done, sign now, please". SC pauses to display to the user the hash and get the PIN directly on its own trusted hardware. If the PIN is entered, SC does the signature and tosses it back to the PC. If the operation is canceled, SC returns some kind of op-cancelled value.
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