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Re^3: Compressing and Encrypting files on Windows

by halley (Prior)
on Nov 01, 2004 at 18:55 UTC ( [id://404377] : note . print w/replies, xml ) Need Help??


in reply to Re^2: Compressing and Encrypting files on Windows
in thread Compressing and Encrypting files on Windows

Geez, tachyon, why don't you tell us what you really feel?

It's one thing to say, "sorry, I think you have that backwards, read my post to understand why;" and a completely different thing to use a caustic, abusive tone in every sentence. We've been without Abigail-II for months now, and I like the change in average tone in the community. Let's not blow it.

--
[ e d @ h a l l e y . c c ]

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Re^4: Compressing and Encrypting files on Windows
by tachyon (Chancellor) on Nov 01, 2004 at 22:42 UTC

    , why don't you tell us what you really feel?

    Because I thought it would get reaped ;-) The OPs post obviously annoyed me. I have no problem with people being wrong. Like most people I spout rubbish from time to time, but I typically have the good grace to add an AFAIK, IMHO, perhaps, maybe or whatever. It was the authoratative presentation of absolutely incorrect information that set me off.

    cheers

    tachyon

      Just a point - if you compress and then encrypt, you are encrypting known pieces of data (block headers, dictionaries, etc). Depending on the compression algorithm, this may give a large enough chunk of data to assist an attack against the encrypted data stream.

      All of this is IIRC, of course ;)

      --MidLifeXis

        As you say knowing that the first two bytes of a valid decrypt must be say the gzip header bytes 0x1f 0x8b does provide a small chink that can potentially be exploited. If you are that paranoid they are easy to hide. Making two passes with the encryption algorithm is one easy way.

        cheers

        tachyon