Question related the the 'Documents in the cloud use case'

Hi,

I have a problem understanding the ‘Documents in the Cloud' use case [1]

Bullet 1 states that “...it generates both signature and encryption key pairs. Derivation may be similar to the”

But shouldn’t the encryption keys be derived from a password or passphrase using for example PBKDF2? If not, I don’t see how you can decrypt the documents stored in the cloud using another web browser (which even might not have generated its key pairs at this moment). Are I missing something?

Kind regards,

Nick

1: http://www.w3.org/TR/2013/WD-webcrypto-usecases-20130108/#savemystuff

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