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