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===Patching===
Operating systems, like all software, may contain bugs in need of fixing or may be enhanced with the addition of new features; many UNIX systems come with a package manager for this. Patching the operating system in a secure manner requires that the software come from a trustworthy source and not have been altered since it was packaged. Common methods for verifying that operating system patches have not been altered include the use of the [[digital signature]] of a [[cryptographic hash]], such as a [[SHA-2|SHA-256]] based checksum, or the use of read-only media.{{Citation needed|date=April 2024}}
==Viruses and virus scanners==
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