![]() For example, even a single-byte change to correct a misspelling invalidates the digital signature. ![]() Such files include the INF file, the catalog file, and all files that are copied by INF CopyFiles directives. PnP device installation considers the digital signature of a driver package to be invalid if any file in the driver package is altered after the driver package was signed. Regardless of the intended operating system, cryptographic technology is used to digitally-sign the catalog file. Plug and Play (PnP) device installation recognizes the signed catalog file of a driver package as the digital signature for the driver package, where each thumbprint in the catalog file corresponds to a file that is installed by the driver package. Each thumbprint corresponds to a file that is included in the collection. A catalog file contains a collection of cryptographic hashes, or thumbprints. cat) can be used as a digital signature for an arbitrary collection of files.
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