Blacklist

Definition:

A blacklist is a list of entities, such as IP addresses, domains, or email addresses, that are blocked from accessing a network, system, or service due to malicious behavior or suspicious activity.

Use Cases:

  • Used by firewalls and email filters to block traffic from known malicious IP addresses or domains.
  • Employed by spam filters to prevent unwanted emails from reaching inboxes.

Related Terms:

Questions and Answers:

  • What is the purpose of a blacklist in cybersecurity?
    The purpose is to block access to entities that have been identified as a threat, such as malware-distributing domains or malicious IP addresses.

  • How are blacklists maintained?
    Blacklists are maintained by security teams or automated systems, which update them based on threat intelligence and new discoveries of malicious activity.

  • What is the difference between a blacklist and a whitelist?
    A blacklist blocks certain entities, while a whitelist allows only specific entities to access a system, creating a more restrictive security environment.
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