NCC-Sign and MQ-Sign Version 2.1 Release

[Cryptography NIMS]

Dear all,

We announce that NCC-Sign and MQ-Sign are updated to version 2.1.

The main updates are as follows.

# NCC-Sign
- Fixed SUPERCOP checksum issue in the AVX2 optimized version.
- Bug in the rejection process has been fixed.
- Applied some suggestions and patches from Prof. D. J. Bernstein.
- Improved the reference source code structure for better performance.
- Released Cortex-M4 optimized version.

# MQ-Sign
- Made Crypto API identical to the NIST PQC standard.
- Changes to Makefile rules allow for more concise compilation.
- By modifying the calculation process, performance is slightly improved.
- Removed some legacy parts of the public key, partially reducing the PK size.
- Applied some suggestions and patches from Prof. D. J. Bernstein.

The implementation of version 2.1 is available in our github repository.
https://github.com/NIMS-Cryptography/NCC-Sign-MQ-Sign

Sincerely yours,
NIMS Cryptographic Technology Research Team.