Re: [gentoo-server] easy explanation of the strength of 3DES (and perhaps also IDEA)?

[Martin Hajduch]

>Unfortunately, both algorithms are subject to quantum decryption. (Just
>do a little search on quantum decryption.)
>
>
there is nothing like a quantum decryption
of course, you can (one day) use quantum computing to speed up your 
brute force search for key; this will give you something like a speedup 
from O(n) to O(sqrt(n)) ... that is good and bad at the same time
it gives you a possibility of breaking 3DES in time required for 
breaking DES, but:
- it is not real at the moment
- it won't be real in three years
- it still implies plain text attack
if you don't have plain text, you are almost lost (with 3DES or IDEA)