Replication mechanism, activation mechanism and objective. -replication mechanism: to replicate a virus needs to attach itself to the right code, where it can replicate and spread past security systems into other systems. activation mechanism: most viruses require the user to actually do something. during the 80s and early 90s most viruses were activated when you booted from a floppy disk, or inserted a new floppy disk into an infected drive. nowadays most computer viruss come as email forwards, and they require the user to execute. objective: many viruses have no objective at all, but some have the objective to delete data, hog up memory, or crash the system.
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