On 2012-04-29 4:02 AM, Benjamin Kreuter wrote:
That is assuming that all messages are the same size, which is not generally the case. If Alice, Bob, Carol, and Dave are users, and Alice sends a 150KB encrypted message, Bob sends a 20KB encrypted message, and then at some random point in the future Dave downloads 150KB of encrypted data and Carol downloads 20KB, it is not terribly hard to determine who is communicating with whom.
Typical email pattern is that Ann sends random messages at random times, and every hour or so Bob downloads whatever is on the server, which apt to be a megabyte of spam, several mailing list messages, and so on and so forth and perhaps Ann's message to Bob, thus no size correlation
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