Nowadays, computer viruses are relatively recent. The art of generating malicious code in order to create damage, but most likely generate a certain profit (Malware and spyware) or gain access to the computer itself, is new.

The history of computer viruses as started near 1960, when a game was created in the laboratory of the Bell Company. It was called “Darwin”. The goal of the game was to introduce two independent piece of code in the memory of the computer and let these pieces of code fight themselves off. As a condition, each code would ignore the position of the other snippet of code. For winning the game, they would try to locate the opponent, and try to erase the code of the opponent. This was done without human intervention.
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The firewall name in computing comes from the uses of wall to prevent fire propagation in certain types of building or even the sheet of metal in airplanes and car that separate the cockpit from the engine; thus preventing a fire propagation to the habited area of the aircraft or car.

The same concept is reproduced with a computer firewall. It separates the traffic from an external network to gain access to the internal network of a business. Ultimately it can be used to separate certain portions of your internal network. For example, as a system administrator in your business, you want to prevent the accounting department to access the inner network of the engineering department.
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Aircrack-ng is a freeware suite of software and script that can be a wifi key finder and cracker. The suite can be used to monitor wifi traffic and capture the resulting packets. Once enough packets have been captured, the aircrack-ng script will proceed to crack and find the wifi key associated with the captured network packets.

It can also operate in attack mode, with various attack already builtin the suite with aireplay-ng. These attacks are meant to stimulate the traffic and increase the number of data/captured packets thus decreasing the time it takes to find the wifi key.

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It is now common knowledge that wifi networks are somewhat insecure to protect your data. But most of the today wifi hackers, are not after your personal data, but your bandwidth or to mask themselves behind your ip address.

The first is quite simple to comprehend; free wifi internet is very fun for everyone; but not so much for the person paying for the actual internet connection. Most of us will pay a monthly fee to get internet at home, and nowadays, this internet connection is usually some sort of high speed, such as cable, dsl or even fiber optic. We also have more than one computers/laptop around the house, and to share that internet connection between the computers we have internet routers equipped with a wifi connection. That wifi connection is not limited to your home, but will go outside, and in your neighbours home also. That is why we protect our wifi network connection with a password. This is the basis of protection when it comes to wifi.