Given the popularity of internet networks among people and the internet growth, an appropriate basis has been created to develop and innovate various platforms. Crowd sourcing is one of these platforms that has remarkably been considered in recent years. During the ten recent years since the appearance of crowd sourcing, this technology has been used to perform various activities. On the other side, along with the growth of crowd sourcing, the issue of information security is proposed as one of the existing challenges. Crowd sourcing can be formed to perform basic and purposeful activities to the same degree that is formed by violating moral principles in social environments and with the aim of doing destructive activities. This platform has several security problems due to lack of suitable information about users' background at the time of membership and how they perform. If crowd sourcing systems are faced with security problems and data privacy, there will be a negative effect on accepting and using this technology. The purpose of this study is to explore security problems of crowd sourcing. First, crowd sourcing and its application as well as its security problems are reviewed and then security suggestions and a model to improve crowdsourcing are presented.