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Creeper
Definition - What does Creeper Virus mean?
Creeper virus is a computer virus that is most commonly recognized as the first computer virus. In 1971, Bob Thomas at BBN created Creeper as anexperimental self-duplicating program that was intended not to inflict damage on, but to illustrate a mobile application. Creeper corrupted DEC PDP-10 computers operating on the TENEX operating systemby messing around the installed printers, displaying the message “I’m the creeper, catch me if you can!”
Techopedia explains Creeper Virus
The Creeper virus located a computer on the network,transferred itself to the computer, started to print a file (and stopped), displayed a message on the screen and then started over again. One significant difference between Creeper and other major viruseswas that the Creeper erased its older versions as it duplicated itself. 

While it is now widely credited as being the first computer virus, the concept of a computer virus did not yet exist at thetime of its creation in the 1970s.

Reaper
Reaper is a virus scanner that can spread from one system to another over the Internet, email, via removable media (such as a diskette, CD, DVD or USBdrive) Reaper was designed to protect computers from IBM Creeper virus, which was another virus that spread through eliminating network of infected machines Creeper, therefore although the term virus isknown today as not adopted until 1984, can be considered as the first antivirus Reaper of history.
Its operation is basically search your system for analyzing strings of code that were similar orrelated to the virus. In this way they crawled around the operating system for this chain, and if it was removed.







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