Can decoying provide security against traffic analysis?
How can Bobs prove that their transmissions are junk? Given that the transmissions can be encrypted using information theoretically secure one-time pads (OTPs), it is not possible to prove that they are not significant messages. Even if the messages from Bobs would be assumed to be encrypted with a single cipher of a good grade (AES?) it would be very hard to show that there is no key that decodes a given message into meaningful content, because, assuming such a method would exist, it would simultaneously show that the cipher (AES?) is broken. A statistical method showing that a message from a Bob cannot be an AES-encrypted message would correspond to a distinguisher for AES and that would also signal that it is a weak cipher.