HQC: key encapsulation based on codes

Introduction In 2022, the third round conclusion of the NIST standardization process on post-quantum cryptography selected a key encapsulation mechanism (CRYSTALS-Kyber/ML-KEM), three digital signature schemes (CRYSTALS-Dilithium/ML-DSA, Falcon/FN-DSA and SPHINCS+/SLH-DSA) and opened a fourth round devoted to evaluating an additional...