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List:       gnupg-devel
Subject:    Re: Extend PGP format?
From:       Werner Koch <wk () gnupg ! org>
Date:       1999-09-20 12:42:47
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Yoshioka Tsuneo <yoshioka@xaxon.co.jp> writes:

>  I want to make software that can seek encrypted file. 

The PGP format is not inded for such purposes.  There are some
approaches on how to implement cryptograhic filesystems, you may want
to look at them.

> 1. use ECB mode to encode. 

Don't do this!

> 2. separate Symmetrically Encrypted Data Packet to several small
> packets. File format will be under image.
> 
> Encrypted Session Key for user1
> Encrypted Session Key for user2
> .....
> Symmetric-Key Encrypted Session Key Packet part1
> Symmetric-Key Encrypted Session Key Packet part2
> Symmetric-Key Encrypted Session Key Packet part3
> Symmetric-Key Encrypted Session Key Packet part4

This should work, but it is not compatible to the OpenPGP format.


-- 
Werner Koch at guug.de           www.gnupg.org           keyid 621CC013

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