Recently, smartphones have become accessories as indispensable as wallets, purses, and keys. A variety of mobile applications have appeared for different purposes. Nowadays mobile phone users have available several mobile applications to request help during a robbery, most are triggered by buttons, also known as panic buttons. These applications are effective if they are launched in a timely manner, but criminals often surprise victims. In crisis moments is almost impossible for victims to press a panic button, since most of the times, smartphones are blocked with a password, wasting vital time in unblocking it to ask for help, in addition to the fact that the thief can see this action. This paper presents a mobile solution to send emergency messages when a passerby is being assaulted. Our proposed solution was implemented on an Android application, which is designed to activate and send a message when a person in a dangerous situation, slightly shakes the smartphone. The algorithm recognize the shaking as an assault signal and sends an emergency message to contacts and friends. This message contains geolocation data. The application was tested many times and messages were received in the users' smartphones. During the testbed, we noted that the launching of the application was effective in most attempts.
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