On Sun, 4 May 2008, Scott Guthery wrote:
One useful application of the Katz/Sahai/Waters work is a counter to traffic analysis. One can send the same message to everyone but ensure that only a defined subset can read the message by proper key management. What is less clear is how to ensure that decrytion with the wrong key doesn't yield an understandable (and actionable) message.
This is actually pretty easy to do by, e.g., padding all valid messages with sufficiently-many 0s. Decryption with an incorrect key will result in something "random" that is unlikely to end with the requisite number of 0s (and so will be discarded).
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