Professor Tsuyoshi Takagi, in collaboration with researchers from Nippon Telegraph and Telephone (NTT), Kyushu University Mass-for-Industry Research Institute and Nagasaki Prefectural University, will improve the digital signature scheme QR-UOV and publish a digital signature scheme from Japan that is both compact and efficient. The new technical specifications, including security proofs and implementation techniques to improve processing performance, will be made public. Compared to the initial proposal, the improved processing performance has made the proposed scheme more efficient and compact, and as a quantum computer-resistant quantum computer cryptosystem (PQC) that cannot be cracked even by a quantum computer, the proposed scheme will be adopted as a standard and implemented in society. QR-UOV is a scheme that has been submitted to the US standardisation competition and will advance to the second round in October 2024 and will be presented at the 6th NIST PQC Standardisation Conference in September 2025.