International Journal of Modern Engineering Research (IJMER)
Personal Mobile Devices (PMDs) have become ubiquitous technology. There, steadily increasing computational and storage capabilities have enabled them to over an increasingly large set of services. Mobile devices offer their users lots of possibilities and a feeling of freedom. However, this freedom comes along with new security threats. Sensitive data might be stolen and abused, if an unauthorized person gets unrestricted access to such devices. Considering their significance, it's necessary to ensure that they aren't misused. Therefore, user authentication mechanisms are required. Unfortunately, a less effective and inconvenient PIN based authentication system is used to protect them against their misuse. So far authentication mechanisms like PINs and passwords do not take into account the limited capabilities of user interfaces of mobile devices.