Posted On: Feb 22, 2018
False positive means a detection of a packet that actually isn't malicious. But false negative is something that passes from Firewall and becomes an incident. False positive can be rectified by changing rule-set and manual testing. But false negative could cause compromise of an entire system. Thus, false negative is far dangerous than false positive detection by a firewall or an anti-virus software.
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Information assurance deals with protecting data and information system to keep the data reliable using non-repudiation techniques, backup and so on...