Messages in this thread |  | | From | (David Wagner) | Subject | Re: A patch to loop.c for better cryption support | Date | 16 Oct 2000 18:18:44 GMT |
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Ingo Rohloff wrote: >> There is a paper about why it is a bad idea to use >> sequence numbers for CBC IV's. I just have to find the reference to it. > >Does this mean sequence as in 0,1,2,3,4 ... or does this mean >any pre-calculate-able sequence ? In the former case we might just use >a simple one way hash-function over the requested sector number.
It just means that 0,1,2,3,... is bad. Using SHA1(sector #) should be ok.
But do think carefully about what happens when you modify a sector!! In particular, will you be re-using the old IV when you write the new data? That could be problematic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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