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I've been using Chrome (and Chrome Sync) for many years now. Does that mean Google, the owner of Chrome, knows all my passwords?

I ask because I realized that Google owns Chrome, and also, it is a closed source browser, which means there could be some sort of backdoor that allows the browser to collect my passwords.

Also, is it the same case with Firefox?

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You haven't specified whether you're logging into your browser or not. If you're not signing into Chrome, then any settings, passwords, etc, are just saved locally, and not in the cloud. –  ernie May 14 at 17:15
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@ernie he uses Sync, so it's not all local –  Tim S. May 14 at 20:28
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Google knows everything. If Google isn't able to find something then it doesn't exist.. ;) –  Sp0T May 15 at 8:32

2 Answers 2

Short answer, yes. If sync is enabled, and you opt to save a password, that password will be sent to Google's servers. That said, the data is encrypted, and access to it is limited.

By default, Google encrypts your synced data using your account credentials. Google indicates that this data cannot be decrypted without knowledge of your password, and that in fact, when your credentials change, all synced data must be deleted from their systems, and can then be re-synced from your devices (and in the process is re-encrypted with the your new credentials).

So, if everything is working correctly, Google themselves can be trusted, and the Google infrastructure is sufficiently secure to keep interested third parties out (read NSA, criminal hackers, etc) then your data is safe. That said, however, Google still has the capability to decrypt your data, though they don't make that known. This is simply the result of them being party to the creation of the cipher key (your credentials), leaving them in a position to save and potentially misuse the keys.

This level of trust is more than I would want to place in them, so in this situation, I would choose not to save passwords or sync data to their services, but that's just my preference. Only a fool trusts everyone, but only a bigger fool trusts no one.

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It's worth mentioning that the linked page reads: "Alternatively, you can choose to encrypt all of your synced data with a sync passphrase. This sync passphrase is stored on your computer and isn't sent to Google." –  and31415 May 14 at 19:26
    
@FrankThomas: I don't get it. You can choose your own passphrase when syncing the data. That means Google doesn't know the passphrase and hence can't decrypt the data... does it not? –  Mehrdad May 14 at 19:26
    
@and31415: Oh whoops looks like we mentioned the same thing. –  Mehrdad May 14 at 19:27
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Using Google Chrome for any data that the NSA might be interested in is a horrible mistake. –  JonathanReez May 14 at 19:53
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Yes if you encrypt all data you synch, google states that the operation happens entirely client side, in which case they will not be able to infer the key easily. That does make it safer, but not safe, per se. We have no idea what cipher is in use, whether they maintain a hash of the password, whether your key is the only one, etc. US law doesn't really allow a service to hold encrypted data that they themselves cannot access in response to a lawful intercept request. –  Frank Thomas May 14 at 20:02

It depends on your encryption settings.

  • Encrypt synced passwords with your Google credentials: This is the default option. Your saved passwords are encrypted on Google's servers and protected with your Google Account credentials.

With this option, Google has access to your data.

  • Encrypt all synced data with your own sync passphrase: Select this if you'd like to encrypt all the data you've chosen to sync. You can provide your own passphrase that will only be stored on your computer.

With this option, Google does not have access to your data, assuming they are being honest about what happens with your passphrase (what happens if you forget your passphrase makes it clear that they do not store it for your benefit), don't have some gaping hole (or backdoor) in their sync security, and your passphrase is secure enough to withstand a brute force attempt by Google (such a password is possible, but very atypical).

You can reduce the opportunity for Google to intercept your passwords by using an offline password manager like KeePass in conjunction with Chrome as your browser. You can remove the opportunity entirely by no longer using Google products (what if they really bundled a keylogger with Google Drive or Chrome? And with Gmail, password reset requests could be intercepted in one way or another, possibly resulting in Google accessing your accounts, even if your passwords are uncrackable).

With Firefox, the security of your data hinges on how secure your Firefox Account password is. If you choose a good password, it should be impossible for Mozilla or anyone to access your passwords. However, this makes the assumption that Mozilla is being honest about how the system works, and there's no gaping hole (or backdoor) in their security. You can add an additional measure of security by running your own private Sync server instead of using Mozilla's. Since Firefox is open source and Mozilla has a better track record regarding privacy than Google does, the likelihood of them trying to compromise your data seems far lower.

Choose your paranoia level as you like, and based on your needs. I wouldn't use anything Google for Snowden-level needs, but for ordinary-privacy needs, I'd go with a passphrase on Google Sync at a minimum (so that an attacker accessing your Google Account has another layer to get through before he has your passwords).

Also, note that all of this goes out the window if anyone manages to install a keylogger (maybe complemented by a screen scraper and mouse click recorder to combat on-screen keyboards) on your PC.

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