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Re: Where does your data want to go today?
> > > What problems does compression before encryption have? It at least
> > >seems to work for PGP.
> > >
> > Most compression schemes put a header/index on the front of the
> > compressed data.
> > This makes recognizing the correct decryption very simple.
> >
> > Call it a limited "known plaintext" situation.
>
Using a random IV also limits the effectiveness of using known
headers for "known plaintext" attacks. Also note that a good block
cipher isn't that vulnerable even to "known plaintext" attacks.
--
David F. Ogren
[email protected] (alternate address: [email protected])
PGP Key ID: 0xC626E311
PGP Key Fingerprint: 24 23 CD 15 BF 8D D1 DE 81 71 84 C8 2C E0 4B 01
(public key available via server or by sending a message to
[email protected] with a subject of GETPGPKEY)