I have a macbook air.. Can someone hack my keychain access through an email download attachment link?

I own a Macbook air.. I have just recently went into my gmail account and opened an email from a person that was interested in buying an item that I was selling from craigslist. The email sounded legit, not like a scam.. I usually can spot those out. So then I happen to notice an attachment download link at the bottom, like it was a picture or something. So I opened it, and all of a sudden this "set of keys icon" popped up and starting showing all of my passwords, and certficates, and files from my computer... i went and googled what the keys meant, and it is my computer keychain access.. Which stores and backs up all of my login in passwords and informtion, and administrative options for the computer.. What I am wondering is why would this have opened up as soon as I opened a random email? Am I being hacked for all of my login information, and passwords? Can he access all of what this "Keychain access" is showing me? I am kind of scared and nervous now, because I have never since I have owned this laptop, seen this kind of thing before, expecially opening it up in an email. Please someone, can you give me answers to my concerns. Thank You. Julia.

That was an S/MIME cryptographic signature. The Keychain Access application opened so you could add the sender's public key to your keychain. It's not hacking.

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