A bad sector is an unusable part or subdivision within a track on a magnetic or optical disc located on a computer's hard disk or flash drive. A bad sector is typically formed as a result of physical damage of some sort, or rarely, the operating system's inability to access the information. The physical damage occurs to the disk surface or as a...
A polymorphic virus is a complicated computer virus that affects data types and functions. It is a self-encrypted virus designed to avoid detection by a scanner. Upon infection, the polymorphic virus duplicates itself by creating usable, albeit slightly modified, copies of itself.Polymorphism, in computing terms, means that a single definition can be used with varying amounts of data. In order for scanners to detect this type of virus, brute-force programs must be written to combat and detect the polymorphic virus with novel variant configurations.
Removing polymorphic viruses requires that programmers rewrite language strings, which can be time-consuming, complex and costly. In order to detect polymorphic viruses, a scanner with strong string detection that enables it to scan several different strings - including one for each possible decryption scheme - is necessary. A polymorphic function definition can replace several specific ones that are associated with one type. An example of polymorphism would be if the “C” key was switched to “D,” or “4” to “5,” and so on. Data types and functions are included in polymorphism, and functional programming languages widely use this type of computing technique. Thus, polymorphic viruses can be widely applied.
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