Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Vector Space Approach to Generate Dynamic Keys for Hill Cipher   In this paper, a variant of the Hill cipher is proposed. In the classical
Hill cipher, an invertible matrix is used for encryption but the scheme is
vulnerable to the known-plaintext attack which can reveal the matrix. In our
proposed cryptosystem, each plaintext block is encrypted by a new invertible
key matrix that thwarts the known-plaintext attack. To generate the invertible
matrices which serve as the dynamic keys we make use of the vector spaces,
randomly generated basis and non-singular linear transformation. Resulting
cipher is secure against the known-plaintext attack.

12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
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The categories of this paper are: stat
11
The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an