[cryptography] NIST Randomness Beacon
codesinchaos at gmail.com
Mon Nov 11 11:42:54 EST 2013
On Sun, Nov 10, 2013 at 9:54 AM, Andy Isaacson <adi at hexapodia.org> wrote:
> For example, suppose you use the low bits of the bitcoin blockchain
> hash. An attacker with 10% of the hash power could probabilistically
> attack such a system by chosing blocks with a specific value in those
This can be avoided by running a sequential computation based on that
hash. For example
by hashing it 2^40 times. Obvious downside is that verifying that the
computation was performed
correctly is just as expensive (but parallelizable).
Perhaps there is a function that's sequential and slow in one
direction and fast in the reverse direction.
More information about the cryptography