Separating the Pebbling Model from the Random Oracle Model
Leonid Reyzin
The security of cryptographic constructions that enforce resource usage, such as Proofs of Work or Proofs of Space, is often shown in the random oracle model. This model restricts the class of possible adversaries, because it assumes that the adversary can access some function RO only as a black box, via queries. When the resource in question is space, the random oracle model is often further idealized by assuming that the outputs of RO are usable only in a black box manner: they are either stor