The National Institute of Standards and Technology (NIST) in the United States recently proposed to uniformly expand the block and key length of the Advanced Encryption Standard (AES) to 256 bits to meet the encryption needs under big data processing and quantum computing threats. The current AES uses 128 bit blocks and supports key lengths of 128, 192, and 256 bits. NIST states that increasing block and key lengths can help enhance the ability to counter quantum computing and ensure the security of encryption systems. Meanwhile, other quantum security schemes are being tested, including the post quantum cryptography experiment completed by the Monetary Authority of Singapore and the Bank of France. Although the threat of quantum computing is still decades away, experts are calling for preparation for encryption systems. @gyomei