Generally, programs with digital signatures are issued by regular companies. If they are valid, it means that the program has not been modified. The program is exactly the same as when the company first released it, which is safer.
One function of digital signature program: Right-click the program and select Properties, and we can see the digital signature tab.
Generally speaking, the security update program of Windows 2000/XP released by Microsoft (or the installation program of Microsoft) is digitally signed, so the landlord can download one and have a look.
Digital signature file:
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