On 23-07-2012 3:16, Robert J. Hansen wrote: > Far more likely is a situation where you just don't meet your goals. > For instance, if you encrypt data once with a DES key and then encrypt > it again with a different DES key, you might think this would be 'two > layers' of crypto. In reality, there is always a third DES key which > will be equivalent to encrypting with the first followed by encrypting > with the second -- it's the real-world analogue of the "ROT3 followed by > ROT5 is just ROT8" example I gave.
That would be true if DES was a group, which it is not. That's why 3DES is more secure than single DES. -- ir. J.C.A. Wevers PGP/GPG public keys at http://www.xs4all.nl/~johanw/pgpkeys.html _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
