public key certificate; [0054]FIG. 4 is a diagram illustrating the data format of the public key certificate; [0055]FIG. 5 is a diagram illustrating an example of a format of a person identification certificate; [0056]FIGS. 6A to 6C are diagrams illustrating manners of encrypting a template of a person identification certificate; [0057]FIG. 7 is a table illustrating the types of keys used to encr