Re: Effect of signature on encrypted email
From: Henrick Hellström (henrick.hellstrm_at_telia.com)
Date: 08/04/03
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Date: Mon, 04 Aug 2003 00:06:13 GMT
Mike Nugent wrote:
> Does anyone know how much easier having a constant email .sig makes analyzing
> an email encrypted with public key style crypto (such as gpg or pgp)? I would
> imagine that it would change it to a known plaintext attack.
It doesn't matter. With S/MIME you would anyway get at least as much
known or partly known information from the inner MIME headers and the
PKCS#7 format. Just use TripleDES or AES since they are commonly
believed to resist known plain text attacks. And don't forget to
digitally sign the message.
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