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The title is misleading. Yes, the passes are generated using a crappy and predictable seed value, but the passes are stored in a vault, and good luck breaking into that vault providing you use a strong master password, like a six-word diceware passphrase.

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The vault does no good if you're passwords can be identically recreated by the attacker. Which the "crappy and predictable seed value", in combination with account creation time data, makes trivial. That creation time may be explicitly shown by the service, or at least hinted at through something like the timestamp of the user's first post.

Unless any of the services you sign up for decide to log passwords like Facebook did, or store password hashes insecurely and get their database dumped online. I think it's pretty unsafe to assume that none of the passwords in your vault will leak from the service side, you just have to rely on the important services not screwing it up.

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