Chaffing and Winnowing - How IT Works

How It Works

secure channel insecure channel
Alice Charles Bob
constructs 4 packets, each containing one bit of her message and a valid MAC
Serial Bit MAC
1 1 234
2 0 890
3 0 456
4 1 678
adds 4 chaff packets with inverted bits and invalid MAC, shown in italics (chaffing)
Serial Bit MAC
1 0 321
1 1 234
2 0 890
2 1 987
3 0 456
3 1 543
4 0 765
4 1 678
discards packets with invalid MAC to recover the message (winnowing)

Read more about this topic:  Chaffing And Winnowing

Famous quotes containing the word works:

    The works of the great poets have never yet been read by mankind, for only great poets can read them. They have only been read as the multitude read the stars, at most astrologically, not astronomically.
    Henry David Thoreau (1817–1862)