Cheating in online games
Cheating in online games is an activity that modifies the game experience to give one player an advantage over others. Depending on the game, different activities constitute cheating and it is either a matter of game policy or consensus opinion as to whether a particular activity is considered to be cheating. Johan Huizinga defines cheating as the action of pretending to obey the rules of the game, while secretly subverting them to gain advantage over an opponent.
Cheating reportedly exists in most multiplayer online games, but it is difficult to measure. The Internet and darknets can provide players with the methodology necessary to cheat in online games, sometimes in return for a price.
- 1 Mods
- 2 Bots and software assistance
- 3 Unsporting play
- 4 Implementation of cheats
- 5 Anti-cheating methods and limitations
- 6 Ramifications
- 7 See also
- 8 References
- 9 Further reading
- 10 External links
Mods are modifications to games that are intended to change the gameplay experience. Sometimes, mods are intended to give players an advantage over other players who are not using mods.
Bots and software assistance
Aimbots and triggerbots
An aimbot (sometimes called "auto-aim") is a type of computer game bot used in multiplayer first-person shooter games to provide varying levels of target acquisition assistance to the player. While most common in first person shooter games, they exist in other game types and are sometimes used colloquially with a TriggerBot, which shoots automatically when an opponent appears within the field-of-view or aiming reticule of the player.
Aimbotting relies on the fact that each player's client computer receives information about all the other players, whether they are visible from the player's position on the playing field or not. Targeting is simply a matter of determining the location of any opponent relative to the player's location, and pointing the player's weapon at the target. This targeting works regardless of whether the opponent is behind walls or too far away to be seen directly. If the game being played allows bullets to penetrate surfaces with reduced damage (such as later games in the Call of Duty franchise), the code can be manipulated to cause the bullets to penetrate an infinite amount of material and damage can be adjusted to guarantee a kill regardless of where the bullet lands. This severely magnifies the unfair advantage the aimbot would provide.
Some servers allow inactive players to spectate, watching the game from the viewpoints of the active players. Recording of gameplay actions is also often possible. If someone was using a targeting aimbot, the bot would be plainly obvious to the spectator as unnatural exact position tracking. Some aimbots and triggerbots are blatant while others attempt to hide from spectators the fact they are being used through a number of methods, such as delaying firing to hide the fact it shoots the instant an opponent is in the cheater's crosshair. Some Triggerbot programs can be easily toggled on and off using the mouse or keyboard.
In the peer-to-peer gaming model, lagging is what happens when the stream of data between one or more players gets slowed or interrupted, causing movement to stutter and make opponents appear to behave erratically. By using a lag switch, a player is able to disrupt upload from the client to the server, while their own client queues up the actions performed. The goal is to gain advantage over another player without reciprocation; opponents slow down or stop moving, allowing the lag switch user to easily outmanoeuvre them. From the opponent's perspective, the player using the device may appear to be teleporting, invisible or invincible, while the opponents suffer delayed animations and fast-forwarded game play, delivered in bursts. Some gaming communities refer to this method as "tapping" which refers to the users "tapping" on and off their internet connection to create the lag.
The term "lag switch" encompasses many methods of disrupting the network communication between a client and it's server. One method is by attaching a physical device, called a hardware lag switch, to a standard Ethernet cable. By flipping the switch on and off, the physical connection between the client and the server is disrupted. The newest generation of gaming clients have built in protection against lag switches in the form of voltage detectors, which detect a change in voltage when the switch is flipped. Some manufacturers have taken counter measures to bypass or trick this detector. This can also be achieved by simply unplugging the Ethernet cord going to the client, causing a disruption in the player's internet connection. Other methods, called a software or wireless lag switch, involve using a computer program. In this method, the cheater runs an application on a computer connected to the same network as the client. The application hogs the network bandwidth, disrupting the communication between the client and its server. However, one cannot do this for an unlimited amount of time. Usually, having no internet connection for 30 seconds will cause one's character / player to be kicked from the game due to inactivity / no internet connection.
In the peer-to-peer gaming model, lagging refers to a player with a faster connection flooding an opponent(s) using a basic denial-of-service attack outside the game structure.
Look-ahead cheating is a method of cheating within a peer-to-peer multiplayer gaming architecture where the cheating client gains an unfair advantage by delaying his actions to see what other players do before announcing its own action.
A client can cheat using this method by acting as if it is suffering from high latency; the outgoing packet is forged by attaching a time-stamp that is prior to the actual moment the packet is sent, thereby fooling other clients into thinking that the action was sent at the correct time, but was delayed in arrival. A partial solution is the Lockstep protocol.
Maphack is a generic term that refers to a method or third-party program that enables a user to see more of a level than intended by the developer. A maphacker is a user that deliberately executes such a method or program in the context of a relevant game, whilst maphacking is the act of such.
A common aspect of real-time strategy games is the player's partial limitation or complete inability to see beyond the visibility range of individual game objects that are under their ownership (typically units and structures); this concept is controlled by a mechanism known as the Fog of War. Maphacking usually enables the user to bypass this mechanism, either by removing it entirely and/or by rendering objects through the fog that would not normally be visible. In multiplayer modes, this allows for a distinct advantage against the other players who are subject to the intended settings. The advantage gained can be substantial, especially for the average real-time strategy games that rely on the rock-paper-scissors dynamic to balance out individual objects' varying strengths and weaknesses. Also called "Chams" or "Wallhacks" in most FPS games (such as Cross Fire, Team Fortress 2, and Call of Duty, to name a few) it can enable users to see "through" a wall, the outline of said player is generally seen in a gamma-intensive outline, such as neon greens, blues, reds, extremes (white/black), and pinks. Users can usually set what color to choose.
Wallhacking allows a player to see through solid or opaque objects and/or manipulate or remove textures, to know in advance when an opponent is about to come into targeting range from an occluded area. This can be done by making wall textures transparent, or modifying the game maps to insert polygonal holes into otherwise solid walls.
As with the aimbot, wallhacking relies on the fact that an FPS server usually sends raw positional information for all players in the game, and leaves it up to the client's 3D renderer to hide opponents behind walls, in plant foliage, or in dark shadows. If the game map rendering could be turned off completely, all players could be seen moving around in what appears to be empty space. Complete map hiding offers no advantage to a cheater as they would be unable to navigate the invisible map pathways and obstacles. However if only certain surfaces are made transparent or removed, this leaves just enough of an outline of the world to allow the cheater still to navigate it easily.
When used in conjunction certain wallhacks allow the player to shoot through solid objects, which is known as "opk" (One Place Killing) in such games as Combat Arms, because the killer can generally stay in one spot. A subset known as WhiteWalls removes the color/texture from objects in the surrounding environment, providing distinct contrast to opposition character models, which remain colored/textured. (See ESP for an evolution of the WallHack.) A subset of wallhacking is also called "chamming" (see Skin Cheats).
ASUS released wireframe display drivers in 2001 that enabled players to use wallhacks, announcing the settings as "special weapons" that users could employ in multiplayer games. In a poll by the Online Gamers Association, 90% of its members were against the release of the drivers.
Extrasensory perception, often read incorrectly as "Extrasensory precision" (ESP) in video games displays contextual information such as the health, name, equipment, position and/or orientation of other participants as navigation/directional markers, which would normally be hidden from game players. This may be performed by reading the programs memory with an external program, or intercepting and decoding packets as they travel between the client and the server, or else by reading the memory arrays containing player positions. This is difficult to detect and prove, but is definitely considered cheating.
A fly hack is one that lets the user disable a game's collision boundaries, allowing the player to go through every object on the level, giving a good place to hide, or allowing the player to gain advantage by reaching places that would otherwise be unreachable without the cheat. This is usually combined with the ability to freely move about in any direction, as if the player was flying. This is often inaccurately called noclip. Some servers might monitor the player's position and movement history and decide whether the movement is legitimate, however it's a lot harder to implement in situations where there is high emphasis on the client to process most or all of the game's mechanics.
Removal of game elements
Removals allow the cheater to remove a game's inhibitors or annoyances. These include gun recoil, bullet spread, and visual effects. Such removals can significantly increase a user's firing accuracy, but may be noticeable to other players. Removals may also consist of removing flash bang effects, which normally make the user's screen appear a bright white and mute their sound. With that particular removal, the user can continue play without loss of audiovisual input. Smoke, sky, hands, ground, doors, and many other elements are also removed in order to cheat. A newer, more startling removal removes the ability to be kicked by a game, whether it be by a moderator or by vote-kick. This is often used in conjunction with other cheats/hacks to gain a permanent edge over the competition in a game.
A form of improving one's ranking in league tables, boosting is most common in 1 vs 1 fighting games such as Street Fighter IV and Tekken. Players will set up multiple accounts and play one against the other. The primary account will get an easy win due to no or little input from the second account. The major problem with this method is high cost since the boosting player requires at least two consoles, IP addresses and copies of the game. Additionally, some games allow matches to be uploaded and viewed by others on replay channel. If the boosting player accidentally allows this, their boosting match can be seen by others.
Even without matches being seen, players who boost can usually be easily identified, since they will have an extremely high number of points in relation to the number of matches played. For example, the 'top-ranked' player in Super Street Fighter IV has ≈35,000 pp (player points); in comparison, Daigo Umehara, widely regarded as the best player in the world, currently has ≈6,500 pp.
In games where wins and losses are recorded on a player's account, a player may disconnect when he or she is about to lose, in order to prevent that loss from being recorded. This is usually done by known in game glitches and 3rd party sources via "IP booting".(A firewall software feature) Some players do this if someone is being unfair. In Street Fighter, someone might do a move that will kill if repeatedly used in timing, or set the timer low and hit a player so they can dodge around, and a player might disconnect to avoid an loss which they perceive to be unfair. A similar phenomenon occurs when a server operator boots an opponent or players who they do not support. Disconnecting is considered unsporting, as the opponent may not have his or her "win" recorded.
Some games implement a disconnection penalty, usually by recording the disconnect as a loss, or a loss of experience points. Other games, such as UFC 2009 Undisputed, include a "disconnect" statistic in players' profiles, so players may select a match where the opponent will not be prone to disconnect. Team-based games such as League of Legends are highly dependent on each member participating, and one member disconnecting can greatly alter the outcome of the match so temporary bans are employed to discourage such behaviour. The later games in the Call Of Duty give extra experience points for staying in a match, and records games in which the player leaves as a loss. Halo: Reach gives a random "lottery" experience-point bonus to players at the end of each match, encouraging them to stay until the end.
Rapid Fire Modifications
In games (mostly first person shooters) weapons featured can be fired in burst fire or single shot. For some gamers, modifying their controller or console to gain the advantage of having a faster shooting weapon than the standard player can be considered as a method of cheating.
These modifications can create an imbalance within the game. In the Call of Duty series, having a semi-automatic pistol or rifle with a rapid fire modification could display the player as having the firing abilities of a heavy machine gun. In addition to modifying a console or its controller, it is possible to achieve a similar effect on the PC by binding the firing button to the scroll wheel of a mouse or using a macro setting that will tap automatically. With semi-automatic weaponry in games such as Call of Duty 4: Modern Warfare seemingly limited to firing as quickly as a player can press the required button, the scroll wheel/macro egregiously abuses this limitation, allowing them to fire pistols and the like far faster than was originally intended. This exploit has not yet been prevented in many instances of first-person shooters, however some games limit the rate at which semi-automatic weapons can be fired at, regardless of how fast a player presses the button.
Exploiting is the application of an unintended use or bug that gives the player an advantage. Not all gamers view exploits as cheating, some view it as another skill because certain exploits take a significant amount of time to find, or dexterity and timing to use. An example of dexterity exploits include bunny hopping and texture-climbing in Quake, as well as so-called "wave-dashing" in Super Smash Bros. Melee. In the video game Ace of Spades (video game), and the infamous wall bugs in GTA IV the map boundary is often easily accessible to every player, so it is not always considered cheating. Exploits are often considered cheating when they have an unbalancing effect, or are used in an intended manner.
Chameleon skins, cham-hacks or chams, replace player model textures with brightly colored skins, often bright red/yellow or blue/green, that change color depending on whether the model is visible. For instance, an exposed part of an opponent would be shown in a different color, giving a cham-hack user an advantage over non-hack users, especially in games in which camouflage techniques (provided by in-game mechanics, objects or player models) are negated.
While cham-hacks are accomplished using a wallhack subset, historically, user settings (in Quakeworld, for example) or exploits in many older games allowed replacing skins arbitrarily with varying degrees of success—from pseudo-camouflage in dark areas of a map (prior to specular and other advanced lighting techniques) when using a "shadow skin"; to completely disappearing while the skin change propagated to other players; to forcing a plain-white skin on all opponents.
A more obvious skin cheat involves a person wearing a skin that makes him invisible to all players. However, this is a cheat that is easily discovered, especially if the game provides a killcam after each death.
Farming and stat-padding
In games where achievements and player abilities are unlocked by defeating a number of enemies or challenges of a particular class, players may arrange to win or lose against one another in order to obtain the achievements without having to play the game linearly. This is also known as stat-padding, swapping, or boosting, and most players[who?] do not consider it to be cheating unless it is used to win the game (or make it easier to win).
The term farming also refers to the practice of garnering achievements or virtual property for the purpose of real-money-trading. With rare exception, this has no direct effect on the gaming experience of other players; instead, it is a violation of most EULAs and could devalue the virtual property being farmed.
A special type of farming that occurs in multiplayer games where multiple players join a game that is based around taking objectives, like capture the flag or domination, but instead of working to take the objective, they focus mainly on scoring kills. This is known as kill farming and is generally frowned upon. This was especially common in Call of Duty: Modern Warfare 2, where players would become angry and bitter when others would try and advance the game (e.g. planting a bomb at a target location that, if allowed to detonate, would end the game) and would discourage their team from protecting the bomb so the enemy could defuse it. This is because these players would attempt to farm kills to gain the tactical nuke ability, which would also end the game. Although this isn't considered boosting, critics of the tactical nuke cited this as a reason to exclude it from further Call of Duty games because it ruined the gameplay of objective-based games.
Sharing is when multiple people play using a single character—mainly in MMORPGs—to gain an advantage by having higher online times and/or being able to apply more manpower toward game activities such as leveling or gaining experience. In some MMOs this is not seen as cheating although others such as Nexon's Maplestory, Blizzard Entertainment's World of Warcraft or Jagex's RuneScape specifically forbid it.
Twinking is the act of giving gear intended for higher level characters to lower level characters that would be incapable of obtaining the gear on their own. Twinked characters have a huge advantage over untwinked characters, as well as the rest of the game world. This is usually used by players who wish to create a new character, to help them level more rapidly or gain an unfair advantage in PVP. Most MMORPGs tolerate it, provided that the twinked character is not used in player versus player combat with other characters of the same level, where it would have an unfair advantage over non-twinked characters. Often limits on twinking are placed into the game, usually through strict level or stat requirements to equip the item. Circumventing these level requirements would then be further cheating.
Most games allow other participants to observe the game as it is played from a variety of perspectives; depending on the game, perspectives allow an observer a map overview or attach a "camera" to the movement of a specific player. In doing so, the observer can communicate with an accomplice using a secondary communication methodology (in-game private message, third party communication, or even off-line) to inform friendly players of traps or the position of opponents. An observer can be an active player, using a separate computer, connection and account.
Some systems prevent inactive players from observing the game if they are on the same IP address as an active player, on the grounds that they are probably in close physical proximity; when all players from a single IP address are no longer active participants, they are all allowed to observe. However, this restriction can be easily evaded if there are multiple IP addresses available at one location (a common feature of broadband subscriptions), or if the observer installs remote desktop software on their computer, thus enabling their computer screen to be viewed by select other players in real time.
Similar to ghosting in some respects, if two or more players to engage secret, co-operative play while all are active (especially in MMORPGs) it is considered cheating in many games, in particular when players engage in secondary communication. Using remote desktop software to observe the screens of secret "allies" while one is playing could confer considerable tactical and/or strategic advantages for all players in the "alliance", and would be considered cheating. In some RTS games, this is made difficult by replacing all player names with "unknown". This makes players unable to know who they are private messaging. Starcraft 2 and Warcraft 3 are examples of this anti-secret alliance setting. In games like Super Smash Bros. Brawl, sometimes when not using team battle 2 or more characters would try to attack one character and have one character win. Most of the time these people would be the same character with the same or different costume.
Stacking involves altering game settings or team lineups to give one or more teams an unfair advantage over others. One example includes arranging a team composed of skilled or known players against a team with members of lesser skill. Although this may be a valid and accepted practice in real-life sports, in online games stacking upsets less-skilled players who feel that they aren't being given a fair chance. Less ethical rigging involves weighting the game by providing a player or team with an advantage by outfitting them with better (or more familiar) weapons or equipment, or creating a play field that caters to a certain player, team or playing style.
Scripting is the use of a program or game feature to automate certain actions or behaviors. The use of scripts may or may not be considered cheating, depending on the behavior involved, and whether said behavior is replicable without the use of such script. A script may give the user unusually fast firing rate, unobtainable otherwise, or may perform seemingly trivial tasks such as reloading. Scripts can also tamper with other players' command systems, such as in Crysis games, where a certain script edit known as a "Longpoke" can force all players on a certain server to use the suicide command.
Implementation of cheats
In the client–server model, the server is responsible for information security and enforcing game rules. (See "Efficiency versus security" below for drawbacks.) In the peer-to-peer gaming model, clients run equal code but are still subject to most of the same type of cheats found in the client–server multiplayer model; however, the peer-to-peer multiplayer model has deprecated in favor of the client–server model with the wider adoption of high-speed networks.
"Never trust the client" is a maxim among game developers (as well as other 'types' of developers) that summarizes the model of client–server game design. It means that no information sent from a client should be accepted by a server if it breaks the game rules or the basic mechanics of the game, and that no information should be sent to a client unless it is "need-to-know." For example, a server with no rule enforcement or data integrity checking will synchronize all of the clients with all of the information about all of the other clients. The server will be very fast, but any wallhack program will reveal where all the players in the game are, what team they are on, and what state they're in — health, weapon, ammo etc. At the same time, altered and erroneous data from a client will allow a player to break the game rules, manipulate the server, and even manipulate other clients.
Game code modification
Many cheats are implemented by modifying game software, despite EULAs which forbid modification. While game software distributed in binary-only versions makes it harder to modify code, reverse engineering is possible. Also game data files can be edited separately from the main program and thereby circumvent protections implemented in software.
Wallhacks and maphacks often function by modifying the software. Other cheats analyze or change the game state in memory, such as some aimbots and programs that give infinite ammo or health (often called trainers). Additionally, software with legitimate use outside of gaming can fulfill the role of a cheat when used inside a game. Examples include program accelerators and an auto clicker.
System software modification
Rather than modifying the game code (which the game itself or a 3rd-party protection system may detect), some cheats modify underlying system components. An example of this is graphics driver modifications that ignore depth checking and draw all objects on the screen—a primitive wallhack. System or driver modification is harder to detect, as there are a large number of system drivers that differ from user to user.
Packet interception, tampering & manipulation
The security of game software can be circumvented by intercepting and/or manipulating data in real-time while in transit from the client to the server or vice versa. Interception can be passive (see Ghosting and ESP) or result in active manipulation (see wallhacks); either methodology can be performed on the client machine itself or via an external communication proxy; some aimbots incorporate this methodology.
Anti-cheating methods and limitations
There are many facets of cheating in online games which make the creation of a system to stop cheating very difficult; however, game developers and third party software developers have created or are developing technologies that attempt to prevent cheating. Anti-cheat software is commonly used in popular games such as Team Fortress 2, Quake, or World of Warcraft. A few examples of anti-cheat software are DMW Anticheat, GameGuard, PunkBuster, VAC, ProtectEnviron, ShoxGuard, CleanDoD, XRay, xTrap, HackShield, FairFight, Warden or BattlEye.
Exploits of bugs are usually resolved/removed via a patch to the game; however, not all companies force the patches/updates on users, leaving the actual resolution to individual users.
Client datafile checksums
One common method used to prevent cheating is for a checksum (such as an MD5 sum) to be calculated against each game datafile on the client computer, and for these checksums to be reported to the server before the client can join the game. When a cheater has modified a datafile to give them an advantage over others, the changes will affect the calculated checksum and may result in the client being automatically denied from joining the server if an unknown checksum is detected.
Someone who is attempting to cheat and who has downloaded a cheating package from the Internet may possibly be automatically banned by game servers, if certain well-known hacked datafile checksums are detected by the server during the connection attempt.
Once a datafile has been checked, it is held in a "file open" state, so that other software on the multitasking system can not rename or copy over a file after the check has been done, and the current game session is in progress. When the game session ends, the files are closed until the next check-in. This works only on systems that enforce such file locks, however. The kernel or libraries of a system could be modified to disable the file locking, without making this apparent to the program. Another problem with this approach is that the client can substitute the calculated checksum with the checksum for the original data.
Non-standard datafile storage
Some games work to prevent hacking by storing game data in a custom-built private database format that strips file names and directory structures, but does not otherwise encrypt the file data. This is commonly visible as two files, one containing file data for all objects, textures, sounds, maps, etc. that is typically several gigabytes in size. A second file only a few megabytes in size contains the file and directory structure for the game to access data within the larger file.
Hackers sometimes examine these data structures to write unpackers that convert the database into a normal editable file and directory structure. The game engine may or may not use this extracted structure if it is present in the game installation directory.
Also because the actual game data in this huge file is typically not encoded or compressed, it is possible to look for common data file headers such as for JPEG, MPEG, or WAV and extract these individual files using a ripper, though this is done without knowing the database format or being able to write changes back to the game data structures.
Availability versus usability
Generally, the better the server is at enforcing the rules, the less of a problem cheating will be in the game.
It may not require much code, but when game servers were restricted by limited available resources such as storage, memory, internal bandwidth, and computational capacity due to the technologies available and the cost of the hardware, coupled with internet connections that were slow, it was believed to be necessary to compromise on security for optimization to minimize the impact on the end-user.
Today however, with the increased speed and power of multi-core computers, lower priced hardware, and the increased availability of broadband internet, this has become less of an issue.
Efficiency versus security
Server-side game code makes a trade-off between calculating and sending results for display on a just-in-time basis or trusting the client to calculate and display the results in appropriate sequence as a player progresses. It can do this by sending the parts of the world state needed for immediate display, which can result in client lag under bandwidth constraints, or sending the player the entire world state, which results in faster display for the player under the same bandwidth constraints, but exposes that data to interception or manipulation—a trade-off between security and efficiency.
Some companies and leagues ban suspected cheaters by blacklisting specific installation or serial keys, or user accounts, meaning that the player is effectively prevented from playing the game online. In such cases, the banned player may be able to avoid the ban by purchasing an additional copy of the game which will include a new unbanned serial key.
While game publishers are known to ban players employing cheats, the actual number of players banned is usually not revealed. Exceptions to this include Blizzard Entertainment and Nexon, known for banning cheaters in batches, and publicising the number of banned accounts in order to discourage others from cheating.
- Clive Thompson (2007-04-23). "What Type of Game Cheater Are You?". Wired.com. Retrieved 2009-09-15.
- "How to Hurt the Hackers: "The Scoop on Internet Cheating and How You Can Combat It"". Gamasutra.com. 2000-07-24. Retrieved 2009-09-15.
- Bradley Mitchell. "What Is a Lag Switch?". About.com. Retrieved 2012-12-15.
- "What Our Competitors Won’t Tell You". Premium Lag. September 3, 2009. Retrieved 2012-12-15.
- Jouni Smed and Harri Hakonen (2006). Algorithms and Networking for Computer Games. Wiley. ISBN 0470029749.
- "ASUS releases games cheat drivers". The Register. May 10, 2013±. Retrieved 2013-06-06.
- "Daigo Umehara: The King of Fighters". eurogamer.net. Retrieved 2010-05-18.
- Dibbell, Julian (2008-11-24). "Wired Magazine: 16.12, The Decline and Fall of an Ultra Rich Online Gaming Empire". Wired.com. Retrieved 2009-09-15.
- "Twinking Is Just Another Form Of Cheating | We Fly Spitfires - MMORPG Blog". Blog.weflyspitfires.com. 2009-09-17. Retrieved 2010-07-28.
- "Gartner Says 17 Countries to Surpass 60 Percent Broadband Penetration into the Home by 2012". Gartner.com. Retrieved 2009-09-15.
- Wily Ferret (June 22, 2007). "Intel plays tattle-tale". The Inquirer. Retrieved 2012-12-15.
- Charlie Demerjian (June 24, 2007). "More on Intel anti-cheat technology revealed". the Inquirer. Retrieved 2012-12-15.
- "Total Gaming League Banned Player List". League.totalgamingnetwork.com. Retrieved 2009-09-15.
- Exploiting Online Games, Hoglund, Greg, 2008, Pearson Education, ISBN 978-0-13-227191-2
- Cheating: Gaining Advantage in Videogames, Consalvo, Mia, 2007, MIT Press, ISBN 978-0-262-03365-7
- Aspects of Networking in Multiplayer Computer Games by J.Smed et al., The Electronic Library, volume 20, number 2, pages 87–97, 2002.
- Fair Online Gaming Information on Intel's anti-cheat research initiative and technology.