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  • Algorithm type: key encapsulation mechanism
  • Main cryptographic assumption: Syndrome decoding of structure codes (Hamming Quasi-Cyclic)
  • Scheme authors: Carlos Aguilar Melchor, Nicolas Aragon, Slim Bettaieb, Loïc Bidoux, Olivier Blazy, Jurjen Bos, Jean-Christophe Deneuville, Arnaud Dion, Philippe Gaborit, Jérôme Lacan, Edoardo Persichetti, Jean-Marc Robert, Rascal Véron, Gilles Zémor
  • Authors’ website:
  • Version: 2020/10/01


  • Source of implementation: hqc-submission_2020-10-01 via
  • Implementation version:, master, 865f0bd1d1dceb6624fc27e6395b14d2d03261ad
  • License: Public domain
  • Constant-time: Yes
  • Optimizations: Portable C with AVX2, BMI1, PCLMULQDQ instructions (if available at run-time)

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)
HQC-128 IND-CCA2 1 2249 2289 4481 64
HQC-192 IND-CCA2 3 4522 4562 9026 64
HQC-256 IND-CCA2 5 7245 7285 14469 64

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