Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A framework for public-channel cryptography using chaotic lasers   Two mutually coupled chaotic diode lasers with individual external feedback,
are shown to establish chaos synchronization in the low-frequency fluctuations
regime. A third laser with identical external feedback but coupled
unidirectionally to one of the pair does not synchronize. Both experiments and
simulations reveal the existence of a window of parameters for which
synchronization by mutual coupling is possible but synchronization by
unidirectional coupling is not. This parameter space forms the basis of a
proposed public-channel cryptographic scheme and is robust to various possible
attacks.

25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg