International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Post-quantum Security of Plain OAEP Transform

Ehsan Ebrahimi , University of Luxembourg
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Conference: PKC 2022
Abstract: In this paper, we show that OAEP transform is indistinguishable under chosen ciphertext attack in the quantum random oracle model if the underlying trapdoor permutation is quantum partial-domain one-way. The existing post-quantum security of OAEP (TCC 2016-B ) requires a modification to the OAEP transform using an extra hash function. We prove the security of the OAEP transform without any modification and this answers an open question in one of the finalists of NIST competition, NTRU submission, affirmatively.
Video from PKC 2022
  title={Post-quantum Security of Plain OAEP Transform},
  author={Ehsan Ebrahimi},