Use Private DOs

[Damien Goutte-Gattat]

On 07/29/2015 10:10 AM, Antoine Michard wrote:
> how to delete field or how to show field #3 & #4

Private DOs #3 and #4 are only readable once the User and Admin PIN, 
respectively, have been verified.

So to show the contents of Private DO #3 :

   $ gpg --card-edit
   gpg/card> verify
   [enter your User PIN when prompted]

   gpg/card> list

And to show the contents of Private DO #4 :

   $ gpg --card-edit
   gpg/card> admin verify
   [enter your Admin PIN when prompted]

   gpg/card> list

As for the deleting the contents of one of those fields, I don't think 
you can specify an empty value (gpg's card editor won't let you do that 
anyway, as you have seen). What you *can* do is replacing the contents 
by any non-significant value, such as "none", "0", or even a 
non-breakable space character (a normal space character won't do, 
because it will be trimmed by gpg).

Damien

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