Problems with keypad on Cherry ST-2000U card reader

Johannes Zarl johannes at
Wed Oct 9 19:50:20 CEST 2013

Hello again,

I'm just pushing this thread so it might get some attention. I'm not quite 
sure whether the lack of replies means that I did not formulate my question 
clearly or that nobody knows an answer.

If it's the former: I'll gladly try to refine my question once I know what 
part is unclear.

If it's the latter: What is the right place to ask questions regarding card 
reader support in gpg?

Kind regards,

P.S.: I did try again with gpg version 2.0.22, but the results are the same.

On Friday 27 September 2013 13:36:44 Johannes Zarl wrote:
> Hi,
> I recently got my fellowship card and now try to get a working setup. My
> first tries with a ReinerSCT cyberjack that I had lying around did not get
> me anywhere, so I bought a Cherry ST-2000U which looked like it should work
> with the internal CCID driver. The reader is "mostly" working, i.e. I can't
> get the pin entry via internal keypad to work.
> Symptoms:
> Using pcscd (and therefore pinentry on my pc), the reader works flawlessly.
> Using the internal driver (after stopping pcscd), "gpg --card-status" works
> fine.
> When an operation needs the pin, the reader switches correctly into pin
> entry mode (judging by the leds). Regardless of whether I enter the correct
> pin or an incorrect one, after pressing the "ok"/green key, the operation
> is aborted.
> Using gpg (not gpg2), I get the following message after hitting "ok":
> gpg: sending command `SCD PKDECRYPT' to agent failed: ec=6.55
> Except for this additional message, gpg and gpg2 behave exactly the same.
> I'm using the following versions (on Debian sid):
> gpg (GnuPG) 1.4.14
> gpg (GnuPG) 2.0.21
> libgcrypt 1.5.3
> Card info:
> Version ..........: 2.0
> Manufacturer .....: ZeitControl
> Card reader (lsusb):
> Bus 006 Device 003: ID 046a:003e Cherry GmbH SmartTerminal ST-2xx
> Any idea what could be the problem or how I can debug the issue?
> Thanks,
>   Johannes
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