Hello!
I’m the creator of the Hash And Encrypt Tools Code Plugin on the marketplace at https://www.fab.com/listings/dfe81bf0-76e1-445e-81c9-6ecbe54f9862. The source code is also available for free on GitHub at GitHub - JasonHoku/UE-Hash-And-Encrypt-Tools. I’ve written several functions that can encrypt and decrypt data in engine, to and from the hard disc and it can be customized to change the encryption methods as you see fit. Feel free to check it out and let me know if you have any questions!
I believe UE does actually encrypt it’s packaged shipping build game data and you can find an option for it in project settings which last I checked is defaulted to on but some people are able to obfuscate the generic UE encryption. So my plugin/code is mostly good for creating a custom encryption method and dealing with data created or managed after packaging.