Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Steganography Protocols for Quantum Channels   We study several versions of a quantum steganography problem, in which two
legitimate parties attempt to conceal a cypher in a quantum cover transmitted
over a quantum channel without arising suspicion from a warden who intercepts
the cover. In all our models, we assume that the warden has an inaccurate
knowledge of the quantum channel and we formulate several variations of the
steganography problem depending on the tasks used as the cover and the cypher
task. In particular, when the cover task is classical communication, we show
that the cypher task can be classical communication or entanglement sharing;
when the cover task is entanglement sharing and the main channel is noiseless,
we show that the cypher task can be randomness sharing; when the cover task is
quantum communication and the main channel is noiseless, we show that the
cypher task can be classical communication. In the latter case, our results
improve earlier ones by relaxing the need for a shared key between the
transmitter and the receiver and hold under milder assumptions on the cover
quantum communication code.

35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys