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A situation where the remote datastore is compromised and now with it, all of my passwords. Or if I was to buy into 1Password's worldview, all of my credit cards, bank accounts, ID cards, everything I want to keep a secure digital copy of, is at risk. Having a sense of control is a huge part of the way we think. Despite the greater risk of death in a car compared to an aeroplane, there's less concerns about car travel because there's a sense of control. Similarly, having the data under my control may be less secure, but that's still within my control rather than dependent on someone else doing the right thing. |
Your data is encrypted locally on your devices, it is never available in a decrypted form on any of our servers. A compromise of our servers would result in the attacker getting gibberish (encrypted data).
To decrypt that data the attacker will need both your Master Password and your Secret Key. A Secret Key is a 128-bit key generated locally on your device, your Master Password is a passphrase set by you. These two keys are combined and, to simplify greatly, used to decrypt your data.
The only way an attacker is going to acquire your Master Password and Secret Key are from your devices. Those are the only places those keys really exist.
Guessing both the Secret Key and a strong Master Password are effectively going to cost such a significant amount of money, or due to time and processing constraints, be infeasible.
An attack would have to be highly targeted. In other words, you would have to be a specific target to make any attack be worthwhile. If you believe you are likely to be the target of such a very specific attack you probably have a team of security personnel working for you who could better advise you than I could.
I'd really suggest looking into how we do things. The only feasible attack on your data would be through your devices, and any other password manager that stores data locally on your devices will be impacted the same exact way in this case.
Hope that helps but if you have questions please let me know and I'll do my best to help get you answers.
Kyle
1Password Security Team
Edit: apparently markdown isn't a thing here.