CryptoDB
Ehsan Ebrahimi
Publications
Year
Venue
Title
2022
PKC
Post-quantum Security of Plain OAEP Transform
📺
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.
2021
TCC
Relationships between quantum IND-CPA notions
📺
Abstract
An encryption scheme is called indistinguishable under chosen plaintext attack (short IND-CPA) if an attacker cannot distinguish the encryptions of two messages of his choice. There are other variants of this definition but they all turn out to be equivalent in the classical case.
In this paper, we give a comprehensive overview of these different variants of IND-CPA
for symmetric encryption schemes in the quantum setting.
We investigate the relationships between these notions
and prove various equivalences, implications, non-equivalences, and non-implications between these variants.
Coauthors
- Tore V. Carstens (1)
- Gelo N. Tabia (1)
- Dominique Unruh (1)