ANJANA K P
NIKHIL V N
SHARANYA K.P
VARSHA A

Cloud computing is a computing paradigm, where a large pool of systems are connected
in private or public networks, to provide dynamically scalable infrastructure for application,
data and file storage. Cloud computing has many advantages including information shared
in the virtual environment, dynamic scalability, utility of storage and utilization of software,
platform and infrastructure, managed distributed computing power, and so on. In spite of
these features the reliability of these models is greatly influenced by some security issues
such as user authentication. The user authentication is said to be the most important
security issue and it is considered as a core requirement for cloud computing. The main
security issues are Google hacking, broken authentication, shoulder surfing, IP spoofing and
dictionary attacks. A shoulder-surfing resistant and a key-logger authentication system
based on graphical passwords can overcome this problem to a great extent.