Because worms are generally spread by unknown users through URL links in instant messages, many of these types of malicious codes can be avoided by blocking unknown users from contacting you.

Files and URLs are often transferred through instant messaging clients without passing through security devices-such as firewalls, uniform resource locator (URL) filtering, and gateway security devices-promoting the spread of malicious code through an unregulated medium. Instant messaging services have become an increasingly popular vector for spreading malicious codes because these codes can spread rapidly through instant messaging services. The client and service do not provide central administration for the regulation and logging of the information being exchanged, which may result in the distribution of confidential information to the parties that should not be viewing this information. ICQ covers the basics of instant messaging, such as text, voice, and video communication. Many original users of ICQ transitioned to other instant messaging services, leaving ICQ with a diminished user base. The chapter explores ICQ, which was a very popular client and considered a pioneer in providing instant messaging services to the majority of users with Microsoft Windows operating systems.

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