OpenPGP Algorithm Defaults
These are the algorithms you prefer others to use when they send encrypted messages to you. To print and change those settings, use
gpg --edit-key [key-id]. You can list the settings in a more readable way without looking up the algorithm IDs in RFC 4880 using
, and set it afterwards using
setpref cannot change only some preferred algorithms (like only digest algorithms), you have to list all three categories at the same time. If you omit some, it will fall back to the most universal defaults which all OpenPGP implementations following RFC 4880 are required to offer.
An example line proposed again and again is
setpref SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed
Minimum Required Set of Algorithms
But be aware, that GnuPG will automatically add 3DES, SHA1, uncompressed and those are the minimum set of algorithms all implementations must or should support. If you don't choose any compression algorithm, also ZIP will be added to the list. You can observe this default setting by setting any of those as preference, and nothing else:
gpg> setpref uncompressed
Set preference list to:
Features: MDC, Keyserver no-modify
Defaults might be different based on compliance options used.