I made a program for android phones with using eclypse that parents can see when a parent of a child wants to know where his/her child is. In this program when a parent sends a sms that contains only a text "send location", in child's phone, the number that send message ("send location") is shown on the list of my program. If child want to send his/her gps coordinates to this number he/she tick the "send" button and a text message that contain "Here is my location: (the coordinates) " is send to this number. If child does not want to send his/her coordinates, he/she ticks the "don't send" button, and a text message that contains "I am sorry I can't send my location" is send to this number.
I want to make secure this sms traffic.(for ex. Authentication, RSA, Diffie-Helman, hashing etc) I mean when a parent send a message that contains only "send location", child must know that the message come from his/her parents. In addition to this parents also know that the location message is coming from his/her child's phone.
I will send the codes of my program for those interested with my project.
I need this project at May 25