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Which of the following techniques are used to identify if computer files have been changed?
Integrity checking hashes
Network sniffing
Firewall alerts
Permissions sets
File verification is the process of using an algorithm for verifying the integrity or authenticity of a computer file. This can be done by comparing two files bit-by-bit, but requires two copies of the same file, and may miss systematic corruptions which might occur to both files. A more popular approach is to also store checksums (hashes) (message digests) of files for later comparison. https://en.wikipedia.org/wiki/File_verification
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