Kriptografija
Eavesdropper #2
Eavesdropper #1
Receiver
Sender
36 – Noise cryptography
MESSAGE
FEC
CODER
FEC
DECODER
TX
MESSAGE
RX
RX
RX
TX
TX
FEC
DECODER
MESSAGE
FEC
DECODER
FEC
CODER
MESSAGE
Transmission
path with low
attenuation:
optical
fiber
or radio in
Fresnel
region
FEC adds delay!
PTX=PMIN
Amplification without
noise not possible!