Bug#653019: Please provide faster encryption options for netbooks

[Juliusz Chroboczek <jch@pps.jussieu.fr>]

Package: partman-crypto

I'm running Debian on a 1.6 GHz atom netbook.  According to hdparm, the
raw disk can read at over 60MB/s, while the encrypted disk can only do
20MB/s using cypher aes-cbc-essiv:sha256.

It'd be nice if partman-crypto could offer (with all the usual warnings)
a selection to use a weaker but faster cypher.

Thanks,

-- Juliusz