AW: Seperate Session Key and Encrypted Data

Christian Loehle cloehle at
Thu Oct 1 16:52:51 CEST 2015

That's what I would do if I had no other choice. The real downside is
that it doesn't follow a standard(like openpgp) and I will have to write
more code on the client side, compared to a standard openpgp solution.
It just seems like there is no reason why separating the session key and
the data wouldn't be supported, but I couldn't find anything about it.

On 10/01/2015 04:47 PM, Heiko Folkerts wrote:
> Hi Christina,
> why not just use symetric encryption oft he file and encrypt a small file
> containing the password you used to encrypt?
> Ofcourse this kind of encryption works also with 7zip, TrueCrypt that
> support encryption. 7zip hast he advantage that the user don't needs any
> decrypting software at all as long as you send them the password on a secure
> wa e.g. via phone.
> Heiko
> Machen Sie mit und teilen Sie Ihr Wissen auf
> Bitte schützen Sie meine und Ihre privatsphäre und verwenden Sie PGP.
> pub   2048R/B5F8D556 2014-08-06
>   Schl.-Fingerabdruck = 758D DA37 1DA1 1E2F 7CDD  60A2 F3F4 1E8D B5F8 D556
> uid       [ uneing.] Heiko Folkerts <heiko.folkerts at>
> uid       [ uneing.] Heiko Folkerts <heiko at>
> uid       [ uneing.] Heiko Folkerts <heiko_folkerts at>
> sub   4096g/BC0D1006 2015-08-27 [verf„llt: 2016-08-26]
> -----Ursprüngliche Nachricht-----
> Von: Gnupg-users [mailto:gnupg-users-bounces at] Im Auftrag von
> Christian Loehle
> Gesendet: Donnerstag, 1. Oktober 2015 16:38
> An: gnupg-users at
> Betreff: Seperate Session Key and Encrypted Data
> 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.
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