A time stamp is a special form of digital signature that contains reliable time information and thus confirms the exact time of the signature of a program/application. This ensures that the trustworthiness of the signature does not expire when the code signing certificate does expire.
This means that even if a code signing certificate expires, the time stamp service knows that the signature of the software was valid at the time of signing. This means that the signature remains valid beyond the end of the code signing certificate’s term.
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