/PGP disable|enable|info [jid]
 /PGP setkey [jid [key]]

This command manipulate PGP settings for the specified jid (by default the currently selected contact).
Please note that PGP encryption won't be used if no remote PGP support is detected, even if PGP is enabled with this command.

/pgp disable [jid]
 Disable PGP encryption for jid (or the currently selected contact)
/pgp enable [jid]
 Enable PGP encryption for jid (or the currently selected contact)
/pgp info [jid]
 Show current PGP settings for the contact
/pgp setkey [jid [key]]
 Set the PGP key to be used to encrypt message for this contact.
 If no key is provided, the current key is erased.
 You can use the shortcut-jid "." for the currently selected contact.