Trusted Publishers

The Trusted Publishers category, shown in Figure 22-1, lists the digital certificates the user has chosen to trust. A digital certificate is a software signature that can be used to "sign" an Excel add-in or other type of application. The certificate ensures that the application actually originates from where it claims to, and that it has not been tampered with since it was signed. Digital certificates are also called digital signatures.

Digital certificates must be obtained from a certification authority such as VeriSign (www.verisign.com). They are relatively expensive, costing approximately $500 per year to maintain as of this writing. Because of this, the use of digital certificates is rare in Excel VBA development and is not covered in detail in this chapter.

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