On 01/26/2010 10:22 AM, Sebastian Andrzej Siewior wrote: > * Milan Broz | 2010-01-25 19:39:11 [+0100]: >> On 01/25/2010 07:29 PM, Mikulas Patocka wrote: >>> When using arc4 to encrypt a block device, the resulting device is >>> unreliable. It reads garbage. That's because arc4 is a stream cipher, if >>> you write something, it advances its state and if you attempt to decrypt >>> the same sector, it uses new state that is different. >>> >>> This patch disables the use of arc4 on block devices. >> >> arc4 again. it is simply not a block cipher:-) >> >> This should be solved inside cryptoAPI and not blacklist it in dm-crypt, >> see that thread >> http://article.gmane.org/gmane.linux.kernel.cryptoapi/3441 > > I some how remember Herbert saying to test for block size > 1. Wouldn't > this be acceptable to block all stream cipher in one go? yes, I think it is better. (...and I just forgot to add that test to dm-crypt after that suggestion.) Milan -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
