debsnap is slow due to gpg descryption

[PICCA Frederic-Emmanuel <frederic-emmanuel.picca@synchrotron-soleil.fr>]

Hello, when I use debsnap in order to obtains a package, I get these message

:~$ LANG=C debsnap hkl
gpg: public key decryption failed: No secret key
gpg: decryption failed: No secret key
gpg: public key decryption failed: No secret key
gpg: decryption failed: No secret key
source-hkl/hkl_5.1.3-1.dsc:
      Good signature found
   validating hkl_5.1.3.orig.tar.xz
   validating hkl_5.1.3-1.debian.tar.xz
All files validated successfully.
gpg: public key decryption failed: No secret key
gpg: decryption failed: No secret key
source-hkl/hkl_5.1.3-1~bpo12+1.dsc:
      Good signature found
   validating hkl_5.1.3.orig.tar.xz
   validating hkl_5.1.3-1~bpo12+1.debian.tar.xz
All files validated successfully.
debsnap: fatal error at line 258:
Destination dir source-hkl already exists.
Please (re)move it first, or use --force to overwrite.

Since I use a nitrokey, If I plug it, get this message

$ LANG=C debsnap hkl
source-hkl/hkl_5.1.3-1.dsc:
      Good signature found
   validating hkl_5.1.3.orig.tar.xz
   validating hkl_5.1.3-1.debian.tar.xz
All files validated successfully.
source-hkl/hkl_5.1.3-1~bpo12+1.dsc:
      Good signature found
   validating hkl_5.1.3.orig.tar.xz
   validating hkl_5.1.3-1~bpo12+1.debian.tar.xz
All files validated successfully.
debsnap: fatal error at line 258:
Destination dir source-hkl already exists.
Please (re)move it first, or use --force to overwrite.

but this is very slow, (almost 3 secondes, per packages...)

So my question is ? why debsnap try to use gpg in order to decryt something.

I would like your advices in ordert o solve this issue.

Fred