PGP keys for many hierarchies are available at ftp://ftp.isc.org/pub/pgpcontrol/README.html
display is from the ImageMagick package. For
the uncompface and icontopbm programs look for a package
like compface or faces-xface on a GNU/Linux system.
On a GNU/Linux system look for packages with names
like netpbm, libgr-progs and compface.
See the function
nnchoke-request-update-info, section 10.7.2.2 Optional Back End Functions.
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