List Archive: gentoo-security
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I am probably being paranoid, but I'd like to encrypt my /home/username
folder on my laptop. I tried EncFS using , but KDE didn't seem to
work under that setup because of the restriction that the filesystem
doesn't support hardlinks. So now I am playing around with . The
only problem I have here is that it seems like I have to know in advance
what size I want to use for my home folder (I am using a file as a
loopback device rather than a partition, mostly because I already have a
system up and don't want to mess with resizing partitions). Is there
any way to resize the loopback device on the fly, or do you just have to
create a new one and copy the files into it every time you need to resize?
Another question I have: I am pretty new to ciphers. One thing I have
learned is that the avalanche effect is desirable, meaning that one bit
flipped in the plaintext should cause about half of the ciphertext bits
to flip. Does the dm-crypt setup have much correlation between
encryption blocks to where this avalanche effect would change the whole
file, or just a few encryption blocks? To illustrate, I'm looking to
encrypt probably something like 40 GB of data. If I change 1 bit
somewhere in my plaintext, how many bytes of that 40 GB of total data on
my loopback device should I expect that bit flip to have an effect on?
Thanks for any enlightenment you can offer!
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