Message-Id: <9303232352(_dot_)AA06852(_at_)transfer(_dot_)stratus(_dot_)com>
Subject: Re: DEK-Info with multiple parameters
Date: Tue, 23 Mar 93 18:52:20 -0500
From: Steve Kent <kent(_at_)BBN(_dot_)COM>
Steve,
If one were to include the "To:" field at the beginning of an
ENCRYPTED PEM message, as might occur if one used a PEM-filter rather
than an integrated PEM module, then the string of predictable text
will most likely extend into the 9-16th bytes, which obviates the
utility of encrypting the IV.
I agree that if the palintext is straight ASCII, cribs will probably abound
past the first 8 bytes.
My issue was only with pre-compression. In that case, of course, the mode
would have to be different (not raw DES-CBC) -- and the new encryption mode
could include encryption of the IV as part of the definition.
I also agree that this issue is in the noise -- just something about
which I was curious.
- Carl