system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are encryption backdoors?

I'm not sure what all the news is about and I don't really understand what backdoors are, and why the NSA wants them, or why they are bad.
gpt
Think of it like an office building, each individual has a key to their own office. Well security has a single master key that can open up all of the offices. Now the thing is when it comes to lets say an encrypted file. You are the only one that should have a key and that key if you set it up correctly should be impossible to replicate. With that in mind you should be able to trust your most sensitive data to stay secure. Well the government is saying that terrorists are using encryption to relay information about planning attacks so they need a "master key" to bypass any encryption so that they can spy on those groups. So it's like you have the key to the front door and they have their own key to your file, like a hidden back door. The main concern with this is obviously now it's not just you with a key to your most sensitive data so does someone else. People not only do not trust the government with that key but another concern is that an individual or group could possibly figure out how to use that back door and use it for malicious reasons. 

TLDR; This kills your privacy. Now you gotta put all your nasty porn on a USB and actually lock it up in a safe.