Here is the scenario, i have a client side android app which need to send an encrypted string to a backend server implemented in php. For this i have chosen an asymmetric algorithm(RSA).My question is that, should i >>
Save a public key in client side and use this for encryption and then send the private key and encrypted string to the backend
or get the public key from backend first and then do the encryption and then send the encrypted string only to the backend
or if neither, can anyone suggest the most followed practice
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