This directory contains the source code of the updated LAC cryptosystem, named LACv2. The source code of previous version is available at:
https://csrc.nist.gov/CSRC/media/Projects/Post-Quantum-Cryptography/documents/round-1/submissions/LAC.zip

In current version, the reference implementation, optimized implementation and AVX2 implementation are all updated according to LACv2. The main modifications include:
- The message length of all security categories are set to be 256 bits;
- The parameter settings of the BCH code are ajusted accordingly; besides, in LAC-256v2, the message is additionally ecoded with D2 after going through the BCH process;
- Ciphertext compression with rounding are used.