BIKE

Algorithm type: Key Encapsulation Mechanism
Main cryptographic assumption: quasi-cyclic syndrome decoding (QCSD)
Scheme authors: Nicolas Aragon, Paulo Barreto, Slim Bettaieb, Loic Bidoux, Olivier Blazy, Jean-Christophe Deneuville, Phillipe Gaborit, Shay Gueron, Tim Guneysu, Carlos Aguilar Melchor, Rafael Misoczki, Edoardo Persichetti, Nicolas Sendrier, Jean-Pierre Tillich, Gilles Zemor
Authors' website: http://bikesuite.org/
Version: 3.2
Added to liboqs by: Shay Gueron and Nir Drucker.

Implementation

Source of implementation: https://bikesuite.org/additional.html
Implementation version: BIKE-1 L1/3 with the BGF decoder (as defined in "QC-MDPC decoders with several shades of gray" at https://eprint.iacr.org/2019/1423)
- BIKE-1-FO L1/3 that matches BIKE's v3.2
- BIKE-1-CPA L1/3 that matches BIKE Round-1 (and BIKE v3.0) for backward compatibility
License: Apache 2.0 License
Constant-time: Yes
Optimizations: Portable C with optional use (selected at compile-time, enabled by default if available) of AVX2 instructions

Parameter set	Security model	Claimed NIST security level	Public key size (bytes)	Secret key size (bytes)	Ciphertext size (bytes)	Shared secret size (bytes)
BIKE1-L1-CPA	IND-CPA	1	2542	3110	2542	32
BIKE1-L3-CPA	IND-CPA	3	4964	5788	4964	32
BIKE1-L1-FO	IND-CCA	1	2946	6460	2946	32
BIKE1-L3-FO	IND-CCA	3	6206	13236	6206	32