More formal software vendors; For example, the installation files of security software vendors, such as Kingsoft Internet Security and nod32.

System patches: For example, every upgrade patch of Microsoft is digitally signed.

Some security vendors: 1 15 browser installation package, u-egg installation package, QQ2010/installation package, etc.

Digital signatures are generated by ensuring that the program has not been modified after publication. If the file is modified, the digital signature will prompt the file to be destroyed.

At this time, you need to use this program carefully.