F-information conceal and conceal-recovery application

As a new theory and method of studying information system, packet sets(P-sets) are set pair combined with internal packet set and outer packet set. Using the outer P-set X^F, the concept of F-information, F-information conceal are given. By using the concept, F-information conceal generation and F-information conceal structure are given, F-information conceal theorem and F-information conceal recovery theorem are given. By using the results, the application of F-information conceal in information transfer is given. Information conceal is a new branch of studying information system.