ABSTRAK :
The development of mobile applications is growing at a rapid pace, since its
inception in creating all those mobile easily socialize with each other easily, on
some phones, which first appeared to the mobile phone evolved into a more easier
for the user. Many users of smartphones, especially Android smartphones cause
entanglement between the user and the device, the Android -based smartphones
are not only used as a communication tool. Various features in it can be used to
support the daily activities for work or entertainment , such as the need for office ,
multimedia, entertainment, connectivity, and so forth. With such a wide variety of
important files or folders stored on the smartphone device. Of course it is very
susceptible to a wide variety of cases lost files , damaged files, and error deleting
files. The purpose of this thesis is to create folders and files keamanaan the
method of using the private key encryption and random adopted during the
application folder lock android tersingkronisasi based on the server. Users are
thus urgently need keamanaan folder encryption application very user benefit, so
that the existing data in the folder will be safer .
Keywords: Android, Encryption, Lock folders
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