Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of a procedure for inserting steganographic data into VoIP
  calls   The paper concerns performance analysis of a steganographic method, dedicated
primarily for VoIP, which was recently filed for patenting under the name LACK.
The performance of the method depends on the procedure of inserting covert data
into the stream of audio packets. After a brief presentation of the LACK
method, the paper focuses on analysis of the dependence of the insertion
procedure on the probability distribution of VoIP call duration.

9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat