Hi, I think you misunderstood me, I don't want to encrypt code or images/content so others can't steal it. I want to encrypt "user data", data that is written/uploaded by the user. I want to do this on the client so the server can't ever see what this data is. The way this should word is that I load the data in the browser and ask the user for the password (which never leaves the browser) to decrypt the data and present it. So how should go about this? Some guidelines or best practices? Any ideas how should I encrypt images? how do I store them? Thank you.

It's not about the transfer between the client and the server. It's about the server/db having no knowledge about what that data is.

Yes the client is the browser. I want to store the user imputed text encrypted in the DB without me (or anyone) having the possibility to decrypt it. I want it on the client side I (the owner of the app) to never have the change to see the data in plain text.