[Resource Topic] 2021/320: Binding BIKE errors to a key pair

Welcome to the resource topic for 2021/320

Title:
Binding BIKE errors to a key pair

Authors: Nir Drucker, Shay Gueron, Dusan Kostic

Abstract:

The KEM BIKE is a Round-3 alternative finalist in the NIST Post-Quantum Cryptography project. It uses the FO$^{\not \bot}$ transformation so that an instantiation with a decoder that has a DFR of 2^{-128} will make it IND-CCA secure. The current BIKE design does not bind the randomness of the ciphertexts (i.e., the error vectors) to a specific public key. We propose to change this design, although currently, there is no attack that leverages this property. This modification can be considered if BIKE is eventually standardized.

ePrint: https://eprint.iacr.org/2021/320

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