Stopping cheaters since 15 06 2012
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Stopping cheaters since 15-06-2012. Game Security. By: Tigran Gasparian. What are we going to talk about ?. Motivation Basics – Protecting highscores Basics – Online games Bot Detection – Motivation Bot Detection – General Bot Detection – MMOs. Why do people cheat ?.

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Stopping cheaters since 15 06 2012

Stopping cheaters since 15-06-2012

Game Security

By: Tigran Gasparian


What are we going to talk about

What are we going to talk about?

  • Motivation

  • Basics – Protectinghighscores

  • Basics – Online games

  • Bot Detection – Motivation

  • Bot Detection – General

  • Bot Detection – MMOs


Why do people cheat

Why do peoplecheat?

  • You can earn money from it

  • It’s fun


Why should we stop them

Whyshould we stop them?

  • Less fun for non-cheaters

  • Damagesyour game economy

  • Shortens the lifespan of your game

  • Whatabout offline games?


Protecting highscores

Protectinghighscores

  • Make it difficult to cheat

    • Makesureit’stoomuchtrouble to cheat.

  • Encryption

  • White box cryptography

  • Send extra information.

  • Use parallel protocols

  • Honeypot

  • Delayed ban


Sending extra info

Sending extra info

  • Types of data:

    • Number of enemies killed

    • Play time

    • Number of clicks

    • Etc.


Parallel protocols

Parallel protocols

  • Handle incorrect data

    • Plain-texthighscores

    • Incorrect extra info

    • Incorrect syntax

    • Etc.


Honey p ot

Honeypot

  • Whendetecting a falsesubmission

    • Show it in the highscoretable

    • Onlyfor the cheater

  • Otherplayersdon’tseeit

  • Cheaterthinkshesucceded

    • He might stop trying.


Delayed ban

Delayed ban

  • Multiple cheatingmethodsavailable

  • Ban at a random time

    • e.g. between 1-2 weeks afterdetection

  • Whatgothimcaught?

  • Potentialdanger?


Online games in general

Online games in general

  • Never trust the client

    • The clientmightnot even be a client

    • Always check some data

  • Performance vs Security

    • Where to do physics?


Modified clients

Modified clients

  • User can change their game client

    • Usually to gain more information.

      • Make walls transparent

      • Make camouflage bright

      • Make models bigger

      • Etc.

  • Check hashes of game data files.


What is a bot

What is a bot?

  • A program that plays the game for you.

    • Scripts that send input into the game client

    • Stand-alone programs

      • Sending packets to the server like the real client

  • Types:

    • Aim bots

    • Player bots

    • Gold/EXP farmers


What can we do

What can we do?

  • Bot’s don’t break the game laws

    • They just automate player actions

  • The only thing we can do is detect them

    • And ban them of course!


So how do we detect them

So how do we detect them?

  • Traditional approach – CAPTCHA

    • Websites use it, it works great!


So how do we detect them1

So how do we detect them?

  • Something more user friendly.

  • Detection by behavior

  • Bots act … weird

    • It’s very hard to exactly simulate human behavior

    • Especially the movement


Detection by behaviour

Detection by behaviour

  • Analyze data you already have

    • Position

    • Orientation

    • Etc.

  • Compare bots to humans

  • Define features

  • Train a neural network to detect bots.

  • ?????

  • Profit!


Quake 2 example

Quake 2 example

  • Data we use for our analysis

    • Position

    • Orientation

  • Features

    • On/off time

    • Movement speed

    • Path smoothness, detours, zig-zagness

    • Rotations 30°, 60°, 90°


Quake 2 example1

Quake 2 example

  • Simple learning algorithm

  • 95% detection rate

    • With 200 seconds of game info

  • This %&#$ works!

See Game Bot Detection Based on Avatar Trajectory for the article


Back to the goldfarmers

Back to the goldfarmers

  • Repetitions in path

  • Very few detours

  • Capture position data

  • Make a simplified path

  • Count segment passes

  • Count repeating sub path length

  • Draw conclusions


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