ArrayIndexOutOfBoundsException : too much data for RSA block

Question

I have some problem with my android application. I am trying to an app related with RSA encryption/decryption.this is my problem:

I can encrypt short sentences clear

Answer 1

In my use case, I need to encrypt some request data to server, from my app.

If I encrypt the AES key with RSA, that's kind of meaningless because the point of using RSA instead of AES, is to prevent reverse-engineering to get the AES key (versus RSA needs a private key stored in server for decryption). Since the AES key needs to be stored in the app locally, I cannot use the approach as suggested by erickson.

Instead, I split the long string into List (Each length suggested by server provider); and encrypt each String.

After that, the List is passed to server in a json array, and let server decrypt each and re-join them.

Of course, this approach needs your server's support, and can potentially has performance issue.