According to AIAG theory, the calculation formulas of CP and Cpk should be based on the standard deviation within each group. In the first picture, it should be consistent with the standard deviation of the corresponding population behind each subgroup, while for the calculation formulas of PP and PPK, the final blue result distribution should be used to calculate the standard deviation.
CPK authentication mechanism can provide concise and secure key management for a large number of users in a trusted environment. This new key generation and storage method can greatly save key storage space, generate almost "infinite" public keys with a small number of seeds, and store tens of millions or hundreds of millions of public key variables in megabit space.
CPK solves the large-scale key management in a simple way, and provides a reliable technical basis for building an authentication system.