![]() Here’s what that first keyset looks like, showing all the critical components: Keyset 1: In all the other keysets, that key is encrypted using the RSA key that we’re about to decrypt. ![]() It was encrypted using the Master Unlock Key (key id “mp”). In the macOS example, we looked at the enc_sym_key item for that first keyset. The first keyset entry for each account is used to decrypt the others. These are stored (predictably) in the keysets table of the 1Password database. Let’s see how this analogy maps up visually:Įvery account includes at least one, and possibly more, keysets. Here’s a full mapping of the (only slightly stretched) metaphor: Steampunk That key corresponds to the key you use to unlock your desk. If you recall, the Master Password eventually decrypts a master key, an AES encryption key stored in the primary vault’s first keyset entry. ![]() I’ve just told you! This structure is exactly how 1Password vaults work. But how does it really work, on the computer? Actual Vault Structure So now we’ve replicated 1Password in the Real World. Drawer key: unlocks drawers, and thus, individual cards (passwords).Coin slot: lets team members add keys to your box.Sealed envelope: protects backup copy of combination.Now, when you need to distribute keys for a new drawer, you just drop the keys through each person’s coin slot, and now they have access.īut what if you forget your combination? Well, naturally, you write it down, and seal that in an envelope (so you’ll know if someone’s tampered with it), and then lock that in a drawer in your desk. Everyone on the team gets one of these, each with their own combination. These all have a combination lock to open the door, and a coin slot on the top. What if one of your team members is out on vacation when you pass out the keys? You obviously can’t just leave the key on their desk… So instead, you order a bunch of little toy banks. Because here’s where it gets interesting. So you get another drawer, put the passwords in there, and give everyone on the team a key to that drawer. Now imagine that you have a different set of passwords that you need to share with your coworkers. (Extra points if it’s made with dark wood and lots of gleaming brass). Being security conscious, you don’t simply leave these cards on your desk – you put them into a drawer and lock it. Because they get changed from time to time, you don’t write them into a book (because you’d also like to keep them neatly sorted), so instead you put them on index cards. Imagine that you have a bunch of passwords you need to keep track of. Rather than jumping straight into the technical bits, let’s look at the system from a different angle. How exactly the vaults are set up is a bit complicated, but it’s all for a very good reason. Well, now it’s finally time to get to the fun stuff! Steampunk 1Password As I’ve said in both prior segments, this key then lets us descend into the vault and decrypt everything else. In both cases, we end up with a decrypted master key, the “sym key” in the account’s first keyset. So far we’ve seen how the Two-Secret Key Derivation (2SKD) process is used to unlock macOS clients, and how the Encrypted Master Key (EMK) does the same under Windows. We’re back with part three of a close look at how 1Password works.
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