Reverse Engineering A Eftpos Machine Part 1
My first blog entry will be about a eftpos keypad terminal that I found whilst dumpster diving(in a sence), I don't wish to name the brand as it's not relevant, I do wish to employ as many reverse engineering techniques as I can muster to discover as much as I can and learn as we go,so I will try and break it down but I'll come back and recompile it all more comprehensively when I can and please be tolerant of my poor English(grammar), school never really agreed with me but here we go it features an rj-45 connection for both power and data, it has a 128 x 64 glcd and in terms of card reading it features a magnetic strip reader and a chip reader, it has a 3v backup battery as well, it has a 1-9 keypad and a few acc buttons, now as you could assume any system of embedded hardware that is going to be at the hands of a 3rd party (the shop keeper, you and I), will have to employ various techniques to ensure that its operations of are safeguarded against malicious intent, mai