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[HDGEM] INTEROPERABILITY of GPG

       GnuPG tries to  be  a  very  flexible  implementation  of  the  OpenPGP
       standard. In particular, GnuPG implements many of the optional parts of
       the standard, such  as  the  SHA-512  hash,  and  the  ZLIB  and  BZIP2
       compression  algorithms.  It  is  important  to  be  aware that not all
       OpenPGP programs  implement  these  optional  algorithms  and  that  by
       forcing  their use via the --cipher-algo, --digest-algo, --cert-digest-
       algo, or --compress-algo options in GnuPG, it is possible to  create  a
       perfectly  valid  OpenPGP  message,  but one that cannot be read by the
       intended recipient.

       There are dozens of variations of OpenPGP programs available, and  each
       supports a slightly different subset of these optional algorithms.  For
       example, until recently, no (unhacked) version  of  PGP  supported  the
       BLOWFISH cipher algorithm. A message using BLOWFISH simply could not be
       read by a PGP  user.  By  default,  GnuPG  uses  the  standard  OpenPGP
       preferences  system  that  will  always  do  the right thing and create
       messages that are usable by all recipients, regardless of which OpenPGP
       program  they  use.  Only override this safe default if you really know
       what you are doing.

       If you absolutely must override the safe default, or if the preferences
       on  a  given  key  are  invalid for some reason, you are far better off
       using the --pgp6, --pgp7, or --pgp8 options. These options are safe  as
       they  do  not  force any particular algorithms in violation of OpenPGP,
       but rather reduce the available algorithms to a "PGP-safe" list.

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Posted By Blogger to HDGEM at 2/14/2017 01:28:00 PM
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