It doesn't work if checksummed on a file-by-file basis: if the file is large enough you can DoS-attack the system just by changing a single byte every so often (oops, the whole file has to be reread...) Checksummed blocks *do* work, and are useful to detect a variety of disk-incurred problems like writes that accidentally landed in the wrong place and so on. But this doesn't help to detect malware because malware is using exactly the same syscalls as non-malware. If used for that purpose it becomes like the UK ID card, where what they really want is an `I am not a terrorist' card... What Talpa is doing, instead, is using what amounts to a huge mugshot database of known bad guys. Unfortunately for them there's no right time to check the data written against the mugshot, and whatever method they use the next generation of malware will specifically evade...
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