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Does blockchain.info use any salt with the passphrase?

I.e., is there any risk associated with using the same passphrase on two different wallets both hosted on blockchain.info?

edit: of course blockchain.info doesn't even keep the hash of the passphrase, as opposite to traditional login systems, so it might not make sense to use a salt in the first place... or does it?

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The risk is that, if a hacker gets a hold of one, then they've gotten a hold of both. Or at least If I had one passphrase, it would be my first guess for the second.

However I dont think there is any inherent technical problem for blockchain.info.

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