Safety, availability, confidentiality and integrity are essentials characteristics for any user of cloud services. Distributed Denial of Service (DDoS) attacks are one of the most widespread threats on cloud computing. In this paper, we simulate DDoS attacks on a storage cloud and we try to assess the impact on the integrity, availability and confidentiality of the data hosted there in order to provide appropriate security mechanisms. For this, we consider the three (03) states of data: namely data at rest, data in transit and data in use. The simulations are based on a series of three (03) scenarios in which, we simulate DDoS attacks with two tools such as LOIC and XerXes, against a storage cloud that we have deployed with Nextcloud. Following the various attack simulations made with LOIC, we see an increase in CPU consumption up to 73% and that of RAM memory to 21.56%. DDoS attack simulations done with XerXes increased CPU consumption to 25% and RAM memory to 29.78%. All of these simulations with LOIC and XerXes had no effect on the integrity and privacy of our data. Nevertheless, we noticed an unavailability of data during the simulations made with XerXes.

DDoS, Cloud Computing, Storage cloud, LOIC, XerXes