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Security Glossary

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Term Definition
False negative
An error that occurs when antivirus software fails to detect that an infected file is truly infected. False negatives are more serious than false positives, although both are undesirable. False negatives are more common with antivirus software because they may miss a new or a heavily modified virus.
False positive
An error that occurs when antivirus software wrongly claims that a virus is infecting a clean file. False positives usually occur when the string chosen for a given virus signature is also present in another program.
A piece of hardware or software that is designed to block unauthorized access while permitting authorized communications. It is configured to permit or deny network transmissions based upon a set of rules. They are designed to protect the network's resources from users on other networks.