Jonathan Katz
Jonathan Katz received his PhD (with distinction) from Columbia University in 2002, and then worked as a professor in the department of computer science at the University of Maryland for over 20 years. He joined Google as a senior staff research scientist in 2023. His research interests include cryptography, differential privacy, and distributed protocols.
Katz is a fellow of the IACR and the ACM.
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The tweakable Even-Mansour construction yields a tweakable block cipher from a public random permutation. We prove post-quantum security of tweakable Even-Mansour when attackers have quantum access to the random permutation but only classical access to the secretly-keyed construction, the relevant setting for most real-world applications. We then use our results to prove post-quantum security—in the same model—of the symmetric-key schemes Chaskey (an ISO-standardized MAC), Elephant (an AEAD finalist of NIST’s lightweight cryptography standardization effort), and a variant of Minalpher (an AEAD second-round candidate of the CAESAR competition).
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