On Fri, 2017-02-24 at 00:57 +0100, Aymeric Vitte via bitcoin-dev wrote: > > I have not worked on this since some time, so that's just thoughts, > but maybe it can render things much more difficult > than computing two files until the same hash is found >
You basically rely on the idea that specific collisions are more difficult to find. This trick or similar tricks will not help. (And actually, the more files you add to the hash, the more freedom you give the attacker.) Even if certain collisions are more difficult to find today (which is certainly true), the general rule is that someone will prove you wrong in a year. Even if ignore security entirely, switching to new hash function is much simpler trying to fix the usage of a broken hash function. Relying on SHA1 is hopeless. We have to get rid of it. Best, Tim _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
