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How does a computer security vulnerability occur?

Vulnerabilities exist because of exploits in code or networking protocols. Millions of lines of code are required to make an operating system, and sometimes vulnerabilities can be found within. It's no different than having a house and accidentally leaving a window open for a burglar to get in easily. Unfortunately, many computer science curricula concentrate on coding projects without regard for coding securely. Security as an afterthought is not as effective as incorporating security in the beginning.


Who made the first keys and locks?

Jeremiah Chubb: Early in the 19th century the British Government offered a prize for the invention of a lock which could be only opened by its own key. The prize was won by Chubb whose lock defined all attempts to be opened by the best picklocks in all the English cells. The ordinary rimlock, which is fixed on the interior doors of most homes and schools, uses the same key, bolt and levers as the lock that Chubb invented. Chubb became famous as the maker of safes; and steel safes bearing his name are still among the best that are used in shop and offices today.


What are category 1234 and 5 twisted pair wire used for?

The purposes for Category 1,2,3,4,5,5e,6, and 7 twisted pair wire are: CAT 1 - Is standard telephone wire and was disigned to carry analog voice or digital data at low speeds (less than or equal to 9600 bps). CAT 2 - Is also used for telephone circuits but is a higher-quality wire than Category 1, producing less noise and signal attenuation. CAT 3 - Is deisigned to transmit 10 Mbps of data over a local area network for distances up to 100 meters (328 feet). CAT 4 - Is designed to transmit 20 Mbps of data for distances up to 100 meters. CAT 5 - Was designed to transmit 100 Mbps of data for distances up to 100 Meters and has a higher number of twists per inch and is manufactured with higher-quality materials than the Category 1 to 4 wires, and introduces less noise. CAT 5e - Is similar to Category 5's in that this wire is also recommended for transmissions of 100 Mbps (100 MHz) for 100 meters. CAT 6 - Is designed to support data transmission with signals as high as 200 MHz for 100 meters. CAT 7 - Is just beginning to appear in Europe and North America. Category 7 wire is designed to support 600 MHz of bandwidth for 100 meters.