[Cryptography] RFC: block cipher randomization
kentborg at borg.org
Mon Jun 27 09:00:21 EDT 2016
On 06/27/2016 05:03 AM, Vlad wrote:
> Please review my proposals for block cipher randomization.
> Any feedback would be very appreciated.
I like it is simple enough that even I can understand it. And even I can
The argument that is can't hurt is nice. But I am not sure I buy it
because it unpredictably changes the amount of data going through, it
changes the number of blocks that need to be encrypted; that will ripple
up to higher layers, possibly breaking things there. Might cause
programmers to craft broken variants on otherwise good encryption modes.
What about doing a fixed expansion, sprinkle exactly N-bytes of random
stuff in pseudorandom locations? That will still keep it from being a
drop-in can't-hurt idea, but seems less dangerous.
More information about the cryptography