My applications generates a .zip containing important files and I don't want that the end user can get access to those data. To compress I use the QuaZIP library.
My first idea was to set a password to the zip file but it seems complicated and not very secure but if you have a solution it will be enough for my need.
Otherwise do you have any idea to easily secure a file? Can I encrypt it?
Thanks a lot. I'm Qt 5.11 and MSVC2017.
The easiest protection: just change the file extension (from .zip to .bin for example). For example using QFile::rename():
QFile::rename("your_file.zip", "your_file.bin");
Another way:
Read all the data from the file and encrypt it. You can use SimpleCrypt:
SimpleCrypt crypto(Q_UINT64_C(0x0c2ad4a4acb9f023)); //some random number. This is your encryption key
...
QByteArray buffer = file.readAll();
QByteArray encryptedBuffer = crypto.encryptToByteArray(buffer.data());
// Write the encrypted data to a new file
QFile newFile("new_file.bin");
...
newFile.write(encryptedBuffer);
Then you can send this newFile.
On the recipient side, read all the data to a buffer from the file you received:
QByteArray encryptedBuffer = receivedFile.readAll();
SimpleCrypt crypto(Q_UINT64_C(0x0c2ad4a4acb9f023)); //same random number: key should match encryption key
QByteArray yourDecryptedData = crypto.decryptToByteArray(encryptedBuffer);