On the Security of NTS-KEM in the Quantum Random Oracle Model.- On the Decipherment of Sidel'nikov-type Cryptosystems.- A New Code-Based Cryptosystem.- On Constant-time QC-MDPC Decoders with Negligible Failure Rate.- Protograph-Based Decoding of Low-Density Parity-Check Codes with Hamming Weight Amplifiers.- MURAVE: A New Rank Code-based Signature with MUltiple RAnk VErification.- Optimized and secure implementation of ROLLO-I.