Perfect forward secrecy

Perfect Forward Secrecy is like having a secret code that changes every time you use it. Imagine you have a diary, and you want to make sure nobody can read it except for yourself. So you make a secret code that you use every time you write in it, but you also make sure that every time you use the code, you come up with a new one so nobody can re-read your diary even if they cracked the code.

Now, let's apply this idea to the internet. When you visit a website, you want to make sure that nobody can see what you're doing or take your personal information. So the website creates a secret code, called a "session key", that keeps all your information private while you're using the website. However, if someone gets that code, they can read everything you did on the website, and that's a problem.

This is where Perfect Forward Secrecy comes in. It's like creating a new secret code every time you visit the website. That way, if someone somehow steals the code you used for one session, they can't use it to read anything else you did on the website because you'll have used a different code. It's much harder for someone to steal all your data this way, and keeps you much safer online.