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RE: Which encryption algorithm used?
From: "Michael Silk" <michaels () phg com au>
Date: Fri, 28 May 2004 11:37:03 +1000


        I don't see any real need to withdraw headers and footers.

        As others suggest, if you chosen encryption algorithm is
        appropriately good (RSA, AES) then anyone who captures your
        transmission can't do anything with it anyway - even if you
        tell them exactly what it is. The bonus from adding headers
        to your files to ease processing is large, and surely your
        security model wont be "well, as long as no-one knows our
        encryption algorithm ..."

-- Michael

-----Original Message-----
From: windo () windowlicker dyn ee [mailto:windo () windowlicker dyn ee]
Sent: Thursday, 27 May 2004 11:49 PM
To: webappsec () securityfocus com
Subject: Re: Which encryption algorithm used?

What do you mean, "with a proper algorithm"?  Cryptographic algorithms 
are supposed to be secure *even when the methods used are known*.  The 
only thing that has to be secret is the key.

Proper algorithm should mean "does not leave headers or footers". The
cyphertext itself should be more or less random and unidentifiable.

Siim P├Áder

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