How to generate a simple registration code,based on input given by the user and verifying it after installation
问题 Suppose, I have created an android mobile application. What I am looking for is, once the user purchases my application from my website, he will input his IMEI number. I want to generate a simple registration code, which can be emailed to him after purchase is successful. The user will then enter the code in the application, application will internally fetch the IMEI number and validate the registration code. How can I generate such registration code? Are there algorithms/ tools available