Index for glossary V
Variant
A modified version of a virus that is usually produced on purpose by a virus
author or by someone who modifies the original virus. Variants may be very
similar to their parent virus, or may be fairly different. Some are text
variants, which means that the only differences between them and their parent
virus are in internal program comments that are never displayed, or in text
that is displayed to the screen. Some are the result of small changes made to
the original virus, apparently to create a new virus which is not detected by
certain anti-virus programs. Some are the result of large changes, such as
combining the spreading part of one virus with the damage part of another.
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Virtual Private Network (VPN)
Virtual Private Network (VPN) establishes a secure connection over un-trusted
network by using a technique called tunnelling, which encapsulates a message
packet within an IP (Internet Protocol) packet for transmission across a
network.
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Virus
A computer virus is a block of executable code that would replicate itself by
attaching to other files or replacing another program.
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Virus Signature
Specific strings of binary code in most viruses (except polymorphic ones) that
allow anti-virus software to identify the virus. New viruses contain new
signatures, which is why it is essential to keep signature files up to date.
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Vishing
Vishing is a type of phishing attack that targeted VoIP. It can be used by the
attacker to steal the identities or money of the victim.
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Vulnerability
A flaw or weakness in a system that could be exploited by intruders to violate
the security policy.
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Vulnerability Scanner
Vulnerability scanner is software that assesses security vulnerabilities in
networks or host systems and produces scan results.
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