[Cryptography] cheap sources of entropy

[dan at geer.org]

All of this discussion about proofs, how certification is done,
the degree to which by the time something is studied to death
an assumption will have changed, etc. -- the lot of it reminds
me of nothing so much as Goodhart's Law:


   Once a social or economic indicator or other surrogate measure
   is made a target for the purpose of conducting social or economic
   policy, then it will lose the information content that would
   qualify it to play such a role.



--dan