The War Operation Plan Response Computer, or WOPR [1]
In 1983, computer networks looked very different, and had their own set of security flaws. Dial up was the only way for two computers in different locations to connect to each other. Despite this system's drawbacks, David Lightman still manages to break into WOPR, a top-secret government computer.
In Wargames, computer systems are a new frontier for many of the people using them. People like General Beringer are ignorant on the topic of networking and computation. By the end of the movie, he and everyone else at NORAD become painfully aware of the power of computers and the importance of network security. In this way, Wargames was a cultural turning point, not just for the characters of Wargames, but for the viewers of the film. The threat of forceful entry into a computer system, now called hacking, entered the public eye and was seen as a real threat [2].
David Lightman stumbles upon the number that connects to the WOPR computer purely by chance, while trying to access games that were yet to be released. He dials all of the numbers registered to the same area that a game company is located in. He finds Global Thermonuclear War in the list of games and tries to play, but the password protection stops him until he researches Dr. Falken, the creator of the system, and finds out that his deceased son's name is Joshua, correctly entering it as the password.
This teaches us a very important lesson about computer security — the more secure a system is, the more difficult it is to access, even by the people who designed it. Developers sometimes create back-doors in their own software to make it easier to access the root system. This Dr. Falken's backdoor is an important plot element in Wargames because it allows Lightman to "play a game" with the WOPR that results in escalation of the US' nuclear alert system to DEFCON 1.
What makes the security flaws of the WOPR system so severe is that none of the system engineers working in NORAD were aware of the flaws. Dr. Falken developed software that could play games against itself, a feature that we now know as machine learning. This is a cutting edge technology today that is being used to develop artificial intelligence, but in 1983 it was hardly known and certainly not understood well by anyone except the experts. Dr. Falken's work was not intended to be used in a real wartime scenario, since he was primarily a researcher, but his self learning games were still incorporated into NORAD's program, especially Global Thermonuclear War. Before Lightman came along, Falken was the only one with the ability to access the simulation from outside the network, since he was the only one aware of the internal functions of the system and the back-door that he created.
David Lightman playing Global Thermonuclear War at home [1]
[1] YouTube, WarGames, 6 Jan. 2020, www.youtube.com/watch?v=HNLQ-O-Qx3Y&t=1779s&ab_channel=YouTubeMovies (20 Sept. 2021)
[2] Quinn, Michael, "Ethics for the Information Age" (Pearson, 2020), 397
[3] Keith D. Foote, "A Breif History of Machine Learning" (Dataversity LLC., 26 Mar. 2019) https://www.dataversity.net/a-brief-history-of-machine-learning/ (20 Sept. 2021)