Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Key Distribution With several intercept-resend attacks Via A
  Depolarizing Channel   The disturbance effect of a depolarizing channel on the security of the
quantum key distribution of the four state BB84 protocol with multiple
sequentiel intercept and resend attacks of many eavesdroppers, has been
studied. The quantum bit error rate and the mutual information are computed for
arbitray number of attacks.

36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom