Security Master is an anti-virus, RAM booster and Junk Cleaner type app which claims to give you an overall security of your phone. But after using this app by my own I came to know that this is not any different from other useless applications in the market. The Concept is to Boost the RAM of your device and cleaning of junk files but it takes alot time to scan the files which is very irritating for a frequent smartphone user, second thing is that everytime it shows the junk files are more than 500mb even after clearing all of those.I think this app creates and shows some fake junk files and show you that it cleaned so much space in your phone. Basically it just clear the cache files which you can by yourself clear it from settings, you don't need any seperate app for this job and same goes with the RAM booster, it kills the running apps to clear the RAM which you can do this easily, the only good feature in this app is the applock if the main purpose to install this app is getting an applock then you should go for it but please don't waste your time expecting it to give you a 360° protection in your phone. Its design and layout is not very good but ya its above average.
at last I want to add that these kind of apps not only waste alot of your time but also these are dangerous for your device. Be Smart, don't install such apps.
Thankyou.
Jai Hind!