3 ms·
Interesting but I don't understand why the probability of two identical blocks in this situation would be 0 for CTR mode. As far as I know theoretically there
by simias 13y ago
Interesting but I don't understand why the probability of two identical blocks in this situation would be 0 for CTR mode.
As far as I know theoretically there could be a collision and the cipher could output the same value for two different counter values, unless the block cipher guarantees that such a collision can never occur? I was not aware of such a guarantee.
- caf 13y agoA block cipher cannot produce the same output block for two distinct input blocks because it is reversible.