  Cloud Computing refers to the use of computer resources as a service
on-demand via internet. It is mainly based on data and applications
outsourcing, traditionally stored on users' computers, to remote servers
(datacenters) owned, administered and managed by third parts. This paper is an
overview of data security issues in the cloud computing. Its objective is to
highlight the principal issues related to data security that raised by cloud
environment. To do this, these issues was classified into three categories:
1-data security issues raised by single cloud characteristics compared to
traditional infrastructure, 2-data security issues raised by data life cycle in
cloud computing (stored, used and transferred data), 3-data security issues
associated to data security attributes (confidentiality, integrity and
availability). For each category, the common solutions used to secure data in
the cloud were emphasized.
