The Problems of Data Security in Cloud Computing and Its Solution Using Petri Nets

摘要

Cloud is understood as a storage which provides space for data storage. The concept of Cloud and Cloud computing has a wider range. It can be characterized as providing services and various applications which are saved on servers while there is access to them through Internet. It is possible to work with data in cloud not only online mode but also in offline--it means to use the state of short-tenn connection and thus save data in mobile connection. Provided that the service is paid, the advantage of it is that the users do not pay for their software but for its use. Scientific publications state that the most often flaw of the service is its vulnerability in the form of data security. It is the reason why nowadays, all the attention is paid to this problematic field. In the report a data security design in Cloud computing will be described and also all the results will be stated that have been acquired through experiments to verify the overall security of a chosen cloud storage. According to measurements of chosen parameters of a basic and an extended cloud storage model, it has been found out that the security increase of data stored in cloud storage brings also worsening of other parameters of the storage. This is particularly the case of the access speed to data that (if they are automatically encrypted) can be influenced by the computing power of a particular PC hardware.