What is Completely Automated Public Turing Test to Tell Computers and Humans Apart (Captchas)

Massively Multiplayer Online Games (MMOGs) have been steadily growing in interest over the past decade. Their economic value turns them into one of the main targets of malware and cheating in Internet. This chapter presents and discusses security issues in MMOG environments. The study starts with a preliminary characterization of MMOGs, highlighting their main features. Afterwards, the authors present the security approaches that are applicable to MMOGs, exposing the implications of security breaches and the need for better protection mechanisms. Next, the chapter presents current safety measures and solutions to tackle specific security issues. Finally, security trends that can be relevant in the future are described.