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Posted by on September 19, 2006, 1:48 pm
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times Key->Hash->Hash. But then I use that key for each iteration.
Thanks for you input.
Lassi Hippel=E4inen wrote:
> david.leedom@gmail.com wrote:
>
> > I am completly new to security development!!!!
> >
> > I am trying to develop a method of saving encrypted data. One method I
> > have used is to create is to encrypt the data and then encrpt it again
> > N number of times.
> >
> > Does this buy me anything, other then a slow process?
>
> If you use the same key in all rounds, you gain nothing.
>
> > Another thought was to do the same, but change the encrtyption methods
> > between iterations.
>
> No better. Don't use several algorithms, use several keys. Google for
> Kerkhoffs' Principle.
>
> > Is there any value in these aproaches am I making a stupid mistake?
>
> There is a certain pedagogical value there ;-)
>
> > My biggest problem in the past is finding algorithums that work the
> > same on both Windows and Lunix.
>
> Use AES as the encryption algorithm, unless you have a good reason to do
> otherwise. There are also well debugged open source libraries out there.
> They'll save lots of your time. (And probably your ass, too, several
> times...)
>
> BTW, there are also full open source programs that run under many systems,
> E.g. TrueCrypt supports both Windows and Linux.
> http://en.wikipedia.org/wiki/TrueCrypt
>=20
> -- Lassi
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