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AW: Loading FR in CFB mode

2004-03-19 01:19:49

I have encountered this problem while trying to use a RSA-Key which has been 
created using PGP 8.0 with our OpenPGP implementation. The secret key is 
encrypted with AES256 and the IV which is part of the secret key packet is only 
8 Bytes long. How can the problem be handled?

Thorsten Weins

-----Ursprüngliche Nachricht-----
Von: Hal Finney [mailto:hal(_at_)finney(_dot_)org] 
Gesendet: Donnerstag, 18. März 2004 18:48
An: ietf-openpgp(_at_)imc(_dot_)org; Weins, Thorsten
Betreff: Re: Loading FR in CFB mode

Thorsten writes:
can anybody tell me how to load the FR in CFB mode (not PGP CFB mode!) 
when the BS is 16 Bytes (e.g. when using AES256) but the IV only 
consists of 8 Bytes.

I assume this is not an OpenPGP question, right?

There is no right answer to this.  The IV should normally be the same size as 
the block size.  If you are using a non-standard, smaller IV then you must have 
an agreement among all participants about how you will handle it.

Hal Finney

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