Limit access to unlocked OpenPGP SmartCard?

Felix E. Klee felix.klee at
Fri Jan 28 23:32:55 CET 2022

Well, I think I could extend my SPR332 [mod][1]:

  * Add a push-button that one has to press to close the C7 circuit for
    I/O.  Without that button pressed, the smart card cannot communicate
    with the reader.  That means, for every operation, one would need to
    hold that button, kind of – but not as elegantly – as with a

  * Using some electronics detect when the green PIN pad ✓-button is
    pressed to confirm PIN entry on the reader.  Let it trigger a timer
    that cuts I/O for good after a few minutes.

Very likely there are some issues that I don’t see at the moment.


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