System and method for resilience to attacks in verifying digital signatures of files

摘要

PROBLEM TO BE SOLVED: To provide a system and a method capable of dealing with an attack on a file digital signature check tool. A digital signature check tool detects an attack on a user computer device targeting a system tool for verifying a digital signature of a file and analyzes the attack by at least one system tool for verifying a digital signature of a file. File to be verified, determine if the DS certificate of the file's digital signature is valid, determine if the digital signature is valid, and if the DS certificate is valid, trust the DS certificate. Determine if you can. [Selection diagram] Fig. 4