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brute-force attacks on cryptoloop or loop-AES

I have been searching the lists for any hints concerning  the high probability of brute-force-attaccks aginst the password of an encrypted filesystem, but did not find much. 

Did any thoughts about this go into the planning of cryptoapi/loop or loop-AES? 

As computing power will increase, this topic will be of more and more relevance for any encryption-software that uses one and the same key.

There is the -S option in loop-AES, which aims to slow down dictionary attacks. Does this mean the computation time for one guess inreases?

many thanks, 

Gerhard
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Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/