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Smartphones provide anytime-anywhere communica- tions and are being increasingly used for a variety of pur- poses, e.g, sending email, performing online transactions, connecting with friends and acquaintances over social net- works. As a result, a considerable amount of sensitive per- sonal information is often generated and stored on smart- phones. Thus, smartphone users may face financial as well as sentimental consequences if such information fall in the wrong hands. To address this problem all smartphones provide some form of user authentication, that is the pro- cess of verifying the user’s identity. Existing authentication mechanisms, such as using 4-digit passcodes or graphical patterns, suffer from multiple limitations - they are neither highly secure nor easy to input. A