Masami Akamine, Jitendra Ajmera
IEICE Trans Inf Syst
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 article 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.
Masami Akamine, Jitendra Ajmera
IEICE Trans Inf Syst
Dzung Phan, Vinicius Lima
INFORMS 2023
Susan L. Spraragen
International Conference on Design and Emotion 2010
Els van Herreweghen, Uta Wille
USENIX Workshop on Smartcard Technology 1999