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Step 3. Binding the Home key is different in Guest modethan it is in User mode. If the Home key button isentered in the Lock Screen, the Guest mode isautomatically entered and the user can only use afew allowable applications.

Step 4. In the Home Launcher application, there are fiveslides and declared icons with widgets. The user canmake widgets, icons, folders, and setting slidesthrough various kinds of touches (touch, long-click,drag, home button, and menu button). If there areany changes or User/Guest processes, HomeLauncher re-organizes the view.

C. Compare with current LockScreen

The wayof input

Convenience Security Note

SlideLock Good No

There s no function given by password.

GlassLock Good No

There s no function given by password.

KeypadLock Bad Normal

Inconvenience becauserepeated touching is required.

PatternLock Normal Normal

A keyspace lower thankeypad lock.

FingerScan Bad Good

Problem with low speed ofrealization.

The wayhow torestrict

Good GoodIt provides upgradedconvenience and securityand it allows multi-inputting.

TABLE I. C OMPARE WITH CURRENT LOCK SCREEN

Security: The security power depends upon the sizeof the key space; the bigger the key space, the moredifficult is a brute force attack. Comparing oursystem to the Pattern Lock and number passwordsystems, the Pattern Lock has about one million keyspaces, the number password system has about10,000 key spaces, and our Lock Screen system hasabout ten million (6^9 = 10077696) key spaces. Itcan also be made larger by increasing the number ofrepetitive touches.

Figure 4. Authentication System Workflow

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