Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-party quantum secure direct communication based on
  Greenberger-Horne-Zeilinger states   We present a three-party simultaneous quantum secure direct communication
(QSDC) scheme by using Greenberger-Horne-Zeilinger (GHZ) states. This scheme
can be directly generalized to $N$-party QSDC by using $n$-particle GHZ states.
We show that the many-party simultaneous QSDC scheme is secure not only against
the intercept-and-resend attack but also against the disturbance attack.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom