@VRonin said in Encrypt String (RSA x509) Android, iOS: @ekkescorner I only now read your username. Sorry for treating you as "not an expert" in network and/or password encryption. I think you still have 2 options apart from OpenSSL: Use Android's built in encryption with QAndroidJniObject: https://www.example-code.com/android/rsa_encryptstrings.asp use CryptoC++ https://www.cryptopp.com/wiki/RSA_Cryptography thx for this worthful info - will try CryptoC++ - need solution for Android and iOS

@VRonin Yes, I've seen that example. It's useful, anyway I'd ship about 4 megabytes of libraries just for the RSA algorithms. Also, I'm planning to deploy on Android so I'd have to find out an OpenSSL build for arm. Sounds like an overly complicated way to use RSA.