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International Association for Cryptologic Research (IACR)
Abstract
We take a critical look at the relationship between the security of
cryptographic schemes in the Random Oracle Model, and the security of the
schemes that result from implementing the random oracle by so called
cryptographic hash functions .
The main result of this paper is a negative one: There exist signature and
encryption schemes that are secure in the Random Oracle Model, but for which
any implementation of the random oracle results in insecure schemes.
In the process of devising the above schemes, we consider possible definitions
for the notion of a good implementation of a random oracle, pointing out
limitations and challenges
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