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  • 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:
  • Version: 3.2
  • Added to liboqs by: Shay Gueron and Nir Drucker.


  • Source of implementation:
  • Implementation version: BIKE-1 L1/3 with the BGF decoder (as defined in “QC-MDPC decoders with several shades of gray” at
    • 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 sets

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

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