Security protection of main key in multilevel key management

Abstract

Leaking of the main key will make all other keys lose their functions.An algorithm of synthesizing the main key based on security tolerance is presented to avoid the problem.The main key was protected by distributing its shares to different key cards and the main key synthesizing server.Key cards,whose shares were modified,could be found by zero-knowledge proof technology.The project ensures that the compromise of a few system components does not compromise the secret information of the main key,and the main key is never reconstructed at a single online location.Security analysis proves that this algorithm makes the whole system have resilience and defence to collusive attack,and the system can keep working after it is attacked.