M - Technische Universität Dresden

DC + -net to protect the recipient even against modifying attacks:
if broadcast error then uniformly distributed modification of keys
key between station
i and j at time t
(Schief-)
field
t−1
t t−k
aij + ∑bij
•
k=t-s
k=1
t
k
Kij =
t t-s t-1
If K ij is revealed, one will start with C i ,..., C i .
at station i at time t
broadcast character
For practical reasons:
Each station has to send within each s successive points in time a
random message and observe, whether the broadcast is “correct“.
If disput then stop revealing. If revealed, distribute new ,..., .
C i
b 1
ij
s
b ij
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