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by bwackwat 3415 days ago
Use AES 256 bit encryption. It looks like you found some openssl command line tools to do this, which appears fine. (I can't speak on the details of that particular tool.) Depending on your technology stack, there are probably a number of tools which can programmatically encrypt and decrypt files.

For example, I use CryptoPP for AES 256 bit encryption in C++.