|
| related topics |
| {alice, bob, state} |
| {key, protocol, security} |
| {qubit, qubits, gate} |
| {cos, sin, state} |
| {bell, inequality, local} |
|
New Approach to Quantum Key Distribution Via Quantum Encryption
A. Fahmi
abstract: In this Paper, we investigate the security of Zhang, Li and Guo quantum key
distribution via quantum encryption protocol [$\text{Phys. Rev. A} \textbf{64},
24302 (2001)$] and show that it is not secure against some of Eve's attacks and
with the probability one half she gets all of keys without being detected by
the two parties. The main defect in this protocol is that there is an attack
strategy by which Eve can change the previously shared Bell state between Alice
and Bob to two Bell states among herself and Alice and Bob. Hence, we show that
with probability $1/d$ its generalization to $d$-dimension systems is not
secure and show that its extension to the case of more partners based on the
reusable GHZ states is not secure and with probability one half Eve gets all of
keys without being detected by the two parties. In what follows, we show how in
going to higher dimensions those protocols can be repaired.
- oai_identifier:
- oai:arXiv.org:quant-ph/0604185
- categories:
- quant-ph
- comments:
- 10 pages, 2 figures, comments welcome
- arxiv_id:
- quant-ph/0604185
- created:
- 2006-04-25
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