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A typical logic bomb tells the computer to execute a set of instructions at a certain date and time or under certain specified conditions. The instructions may tell the computer to display a message on the screen, or it may tell the entire system to start erasing itself. Logic bombs may also find their way into computer systems by way of Trojan horses. Logic bombs often work in tandem with viruses. Whereas a simple virus infects a program and then replicates when the program starts to run, the logic bomb does not replicate - it merely waits for some pre-specified event or time to do its damage.
Some bombs do their damage after a particular program is run a certain number of times.
Trojan horses present a major threat to computer systems, not just because of the damage they themselves can do, but because they provide a technique to facilitate more devastating crimes.
Kavungya answered the question on May 17, 2019 at 09:27
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