Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical Zero-knowledge Proofs for Flow Free, Hamiltonian Cycles, and
  Many-to-many k-disjoint Covering Paths   In this paper we describe protocols which use a standard deck of cards to
provide a perfectly sound zero-knowledge proof for Hamiltonian cycles and Flow
Free puzzles. The latter can easily be extended to provide a protocol for a
zero-knowledge proof of many-to-many k-disjoint path coverings.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th