i created an Android Application that reads data from sensors mounted onto smartphone and sent this data in JSON format to an application server.

I configured server and android app to work over https protocol and to authenticate themselves with a mutual autentication (made up with self-signed certificates).

Now, I was asked to add, in the Android application, the encryption before the client and the server start the authentication process.

In this regard, I want to understand what is the best algorithm between DES and AES from resource consumption point of view.

I don't find anything on web. Can you redirect me to some resource where i can understand more about this argument?