The case of intentional collisions is stronger than that of accidental collisions. If one were to worry about the former with regards to ROT-13, then the idea would be discarded before the latter ever became an issue.
On Sun, Feb 7, 2010 at 12:57 PM, Lyndon Nerenberg (VE6BBM/VE7TFX) <lyn...@orthanc.ca> wrote: >>> Seems to me you should be worried about both. >> >> let's not get carried away. the odds of accidental >> collision are 1 2^80. > > And being worried about both leads to the choice of SHA-1 as a suitable > algorithm. If we weren't worried about it I'm sure some bright light would > have picked ROT-13 for performance reasons. > > >
