Welcome to the resource topic for 2022/1224
Title:
From Plaintext-extractability to IND-CCA Security
Authors: Ehsan Ebrahimi
Abstract:We say a public-key encryption is plaintext-extractable in the random oracle model if there exists an algorithm that given access to all inputs/outputs queries to the random oracles can simulate the decryption oracle. We argue that plaintext-extractability is enough to show the indistinguishably under chosen ciphertext attack (IND-CCA) of OAEP+ transform (Shoup, Crypto 2001) when the underlying trapdoor permutation is one-way.
We extend the result to the quantum random oracle model (QROM) and show that OAEP+ is IND-CCA secure in QROM if the underlying trapdoor permutation is quantum one-way.
ePrint: https://eprint.iacr.org/2022/1224
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