I have used QSslServer and passed the QSslCongifuration::defaultSslConfiguration() value to use it as the configuration data. Seems pretty easy in that respect. The default SSL configuration consists of: no local certificate and no private key protocol SecureProtocols the system's default CA certificate list the cipher list equal to the list of the SSL libraries' supported SSL ciphers that are 128 bits or more Another option is QSslConfiguration::defaultDtlsConfiguration() You have full control over certs, keys, etc. in the QSslConfiguration object. Just depends on how detailed you need to get with it. Usually in my case it's a "same host" sort of deal so I just use the default config.

@dheerendra said in Encrypt/decrypt data with QCA: Your idea was to encrypt using RSA public key and decrypt using the private key. If this is the case what you are doing correct. Just that you read the keys from key.pem. Yes, that's what I want to do. So I guess this is solved. Thank you very much for your help!

@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

Then you should take a look at the SQLCipher project. AFAIK, you can also find instructions to build a Qt SQL plugin with it to use in your project.

@Leonardo I think it's for *nix systems, I want it in windows

I have. Usually all my projects get inspired by either the examples or some other project that someone has put on the web. Its just that sometimes I have trouble moving them to the next level, just like with this one.