Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Number Theoretic Hilbert Transform   This paper presents a general expression for a number-theoretic Hilbert
transform (NHT). The transformations preserve the circulant nature of the
discrete Hilbert transform (DHT) matrix together with alternating values in
each row being zero and non-zero. Specific examples for 4-point, 6-point, and
8-point NHT are provided. The NHT transformation can be used as a primitive to
create cryptographically useful scrambling transformations.

23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas