Why does my firewall reports accesses to crl.microsoft.com sometimes when I run FastPictureViewer?
All binaries (msi/exe/dll) composing FastPictureViewer are digitally signed with a code signing certificate (“Authenticode”), similar in concept to the SSL certificates used in e-commerce to validate the legitimacy of web servers. To ensure the validity of certificates, the Windows operating system sometimes checks a service known as the Certificate Revocation List (or “crl”), some sort of blacklist where stolen or compromised certificates would be reported. This check is done as a security measure by the operating system, at application launch time, before the program’s execution even begins. The WIC image codecs used by FastPictureViewer are also required to be digitally signed by their respective publishers (us, Microsoft, Nikon, Canon, …) as the imaging framework refuses to load non signed plug-ins, whose origin cannot be determined. CRL checks are a good thing, they ensure that the code being run was issued by a legitimate publisher! Digital signatures ensure traceability and in
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