You can get digital certificates from a variety of commercial certificate authorities, each of which has different requirements of how you go about certifying your identity. A certificate is a "seal of approval" from a trusted third party that you are who you say you are. In order to digitally sign a macro, you need to first obtain a digital certificate. (Sort of like the product safety seals on some consumer foods and pharmaceuticals.) In other words, it is a way for users to be sure that a macro hasn't been tampered with. A digital signature allows a user to know that a macro comes from a trusted source and that it hasn't been modified since it was originally saved by that trusted source. This capability was introduced by Microsoft in Excel 2002. One way to help users utilize your macros is to digitally sign them. If the security level is set high enough, the user may not even be able to use the macros at all. When you create macros and share them with others, the availability of those macros depends on the security settings on the user's machine.
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December 2022
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