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What are the Internal Threats
Internal security problems are probably the most common. One never knows what someone is going to do. Even the most loyal employees or workers can change their tune and turn malicious, wreaking havoc on the computing environment.
By thoroughly scrutinising the workers' backgrounds, references, and previous employers carefully, and changing and auditing security methods, especially observation of the work pattern or behaviour of the employees (maybe on a day-today basis), it would be possible to know about the possibilities of internal threats beforehand. Still further, this information would be useful to track down the line easily when any attack takes place.
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