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Comment: Known problems with Yubikey 4
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| that come as smartcards. The smartcards are minicomputers that can hold the secret key material and perform crypto operations. |
that come as smartcards (or USB devices that support this mode). The tokens are minicomputers that can hold the secret key material and perform crypto operations. |
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| == Known problem of Yubikey == | == Known problems with Yubikey 4 == |
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| * Use Yubikey, then, suspend/resume. In this situation, Yubikey requires reset of the device. * With GnuPG 2.2.5 or earlier, you need to plug off Yubikey to plug-in again * The error recovery will be implemented in GnuPG 2.2.6, so that re-plug action will not be required. * Still, user interaction which causes an error is required to detect the event, then, scdaemon does reconnect. |
Windows * After a suspend/resume cycle the Yubikey requires a reset of the device. This is [[https://dev.gnupg.org/T3825|done automatically since GnuPG 2.2.6]], so that the device does not need to be removed and plugged back in. Unfortunately, this reconnect does not happen until the error is triggered, so first a failing operation is required. Linux * After a suspend/resume cycle, scdaemon gets into a state where it can no longer successfully communicate with the card. Resetting the connection is not sufficient, but a 'gpgconf --kill scdaemon' does resolve the issue. |
Smartcard Hints and Information
- Generating and loading subkeys from an offline computer (specifically, for the YubiKey NEO, but recipe can be easily adapted for any smartcard)
- CardReader/PinpadInput
- CardReader/GemaltoPC
- List of smartcard readers and tokens supported by the GnuPG's in-stock CCID driver.
- OpenPGP Card
- How to use the Fellowship Smartcard
- OpenPGPcardECC
Smartcards?
GnuPG supports the use of hardware security tokens that come as smartcards (or USB devices that support this mode). The tokens are minicomputers that can hold the secret key material and perform crypto operations. Because you need to connect the physical "token" to your machine, the secret key material is well protected against attacks that try to steal it.
Smartcards have to be compatible with GnuPG. Cards exist to either run OpenPGP or x509/CMS operations.
In order to try this, see the howto links above, you may need to acquire a smartcard and a reader or an integrated combination of both.
Use an existing Card
Before you can use your existing card, your should import the public key associated with the private key on the card.
Known problems with Yubikey 4
Windows
- After a suspend/resume cycle the Yubikey requires a reset of the device. This is done automatically since GnuPG 2.2.6, so that the device does not need to be removed and plugged back in. Unfortunately, this reconnect does not happen until the error is triggered, so first a failing operation is required.
Linux
- After a suspend/resume cycle, scdaemon gets into a state where it can no longer successfully communicate with the card. Resetting the connection is not sufficient, but a 'gpgconf --kill scdaemon' does resolve the issue.
Known Bug(s) of OpenPGPcard
- Encrypted message with 3DES can't be decrypted with OpenPGP Card (V2.1, V3.3 without fix)
- Due to the bug, it results: Missing item in object <SCD>
- See: https://dev.gnupg.org/T3576