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Computer Security Resource Center

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    Presentations 2021
Presentation

Faster Kyber and Saber via a Generic Fujisaki-Okamoto Transform for Multi-User Security in the QROM

June 9, 2021

Presenters

Julien Duman - Ruhr-Universität Bochum

Description

Constructing an efficient CCA-secure KEM is generally done by first constructing a passively-secure PKE scheme, and then applying the Fujisaki-Okamoto (FO) transformation. The original FO transformation was designed to offer security in a single user setting. A stronger notion, known as multi-user security, considers the attacker’s advantage in breaking one of many user’s ciphertexts. Bellare et al. (EUROCRYPT 2020) showed that standard single user security implies multi-user security with a multiplicative tightness gap equivalent to the number of users.

Event Details

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 Related Topics


            

                Security and Privacy:
                    post-quantum cryptography            

    


        

        






    


            Created June 09, 2021, Updated June 10, 2021