Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak Keys and Cryptanalysis of a Cold War Block Cipher   T-310 is a cipher that was used for encryption of governmental communications
in East Germany during the final years of the Cold War. Due to its complexity
and the encryption process,there was no published attack for a period of more
than 40 years until 2018 by Nicolas T. Courtois et al. in [10]. In this thesis
we study the so called 'long term keys' that were used in the cipher, in order
to expose weaknesses which will assist the design of various attacks on T-310.

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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: eess