Which of these two methods suits better the implementation of a secure chat application? In this context, chat will be limited up to 150 letters for one message.
I would prefer RSA because what I know RSA is really secure if it is used for small text and also if I will use groups it is easy in RSA because of public key distribution. Specially for chat application where user can write very small letters message I don't know if AES will be good for security. AES is better in performance specially if I will compare 256bit vs 4096bit. RSA will be slower for encrypt and decrypt. But my goal is to have strong secure chat and not super fast chat.
What would be the more apt method?
I will use this chat only for sending message, e.g. no attachments, etc.