You can use the --show-session-key and --override-session-key option for gpg.
$ gpg --encrypt <<< "Test Message" > msg $ gpg --decrypt --show-session-key msg $ gpg --decrypt --override-session-key 'the_session_key_gpg_gave_you' Note that you do not need your private key for the last operation. However, I'm not sure of the security implications of this. From the gpg manual: > We think that Key Escrow is a Bad Thing (Sorry if this message appear twice on the list; I couldn't see the first one either in my inbox or the archives of the mailing list.) 2015-10-01 16:38 GMT+02:00 Christian Loehle <cloe...@linutronix.de>: > I want to use gpg to encrypt a potentially large file to some > (cloud-like) storage provider, the recipients are not known at the time > of uploading. > What I want to do is to send the encrypted session key of the file to a > recipient, when I 'add' them, without re-uploading or even touching the > original (encrypted) file. > This should be possible, does anyone know how to? I'm also open to other > suggestions. > > > _______________________________________________ > Gnupg-users mailing list > Gnupg-users@gnupg.org > http://lists.gnupg.org/mailman/listinfo/gnupg-users >
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