From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marco Wahl <marcowahlsoft@gmail.com>
Subject: Re: how to use org-crypt with different key per file or node?
Date: Thu, 26 Apr 2018 17:31:21 +0200
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Gregor Zattler <telegraph@gmx.net> writes:

> Dear org-mode users and developers,
>
> I use org-crypt for different org files.  Till now I follow the
> documentation and specify the one and only key to use via
> (setq org-crypt-key "0xdeadbeef") for all org files and their
> headings.
>
> Is it possible to specify different keys for different files or
> even better for different headings?
>
>
> Ciao; Gregor

AFAICT there is property CRYPTKEY for that.  Possibly this has been
forgotten in the info documentation for org.

Example:

* totally secret :crypt:
:PROPERTIES:
:CRYPTKEY: 0x0123456789012345678901234567890123456789
:END:


HTH