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量子攻击策略
Quantum Information and Computation, Vol. 2, No. 6 (2002) 434–442
c
Rinton Press
A PRACTICAL TROJAN HORSE FOR BELL-INEQUALITY-
BASED QUANTUM CRYPTOGRAPHY
3 ˚ ∗
0 JAN-AKE LARSSON
0 MaPhySto, Department of Mathematical Sciences, University of Aarhus,
2 Ny Munkegade, DK-8000 Aarhus C, Denmark
r
a
M Received January 10, 2002
Revised August 20, 2002
7
1
Quantum Cryptography, or more accurately, Quantum Key Distribution (QKD) is based
2 on using an unconditionally secure “quantum channel” to share a secret key among two
v users. A manufacturer of QKD devices could, intentionally or not, use a (semi-)classical
3 channel instead of the quantum channel, which would remove the supposedly uncon-
7 ditional security. One example is the BB84 protocol, where the quantum channel can
0 be implemented in polarization of single photons. Here, use of several photons instead
1 of one to encode each bit of the key provides a similar but insecure system. For pro-
1 tocols based on violation of a Bell
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