Welcome to the resource topic for 2007/388
Title:
On Ciphertext Undetectability
Authors: Peter Gazi, Martin Stanek
Abstract:We propose a novel security notion for public-key encryption schemes – ciphertext undetectability. Informally, an encryption scheme has the property of ciphertext undetectability, if the attacker is unable to distinguish between valid and invalid ciphertexts. We compare this notion with the established ones, such as indistinguishability of ciphertexts and plaintext awareness. We analyze the possibilities of constructing schemes with the property of ciphertext undetectability. Moreover, we prove that the Damgard ElGamal, the Cramer-Shoup scheme and its lite variant achieve ciphertext undetectability under standard assumptions.
ePrint: https://eprint.iacr.org/2007/388
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