Abstract: The cloud data processing is the vision of the data processing as value, in which cloud consumer possibly its data into the cloud environment over enjoying the first-class quality servers and the fast nets, into which applications store and into the services of a divided pool of configurable operational resources. The advantages of the cloud data processing technology of the cloud cover need self-service mode, everywhere net entrance, independent resources of the location, which combine, fast resource elasticity, wages per the use, which on price estimation - resides, the transfer of the risk, etc... It is large flexibility and economic savings is motivated individuals and the enterprises to outsource to their local complex cloud data environment administration system in the cloud. The security of the data in the cloud is at present a very hot topic. Most enterprises, which still possess sensitive metadata, hesitates „handed over “its data to the cloud. Data security is one of the principal reasons for this dislike. However substantial security is to guarantee resources, which use and therefore expensively. On the other hand it gives customers, who demand only warranties of basic security, since their data are less sensitive. This project can have taken place in two parts: like a first part of the project for the analysis of the present problems and the approaches of data security in the cloud; and as the second subproject for a detailed analysis of the development of a model for the treatment of data security in the cloud.