Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Breaking a novel image encryption scheme based on improved hyperchaotic
  sequences   Recently, a novel image encryption scheme based on improved hyperchaotic
sequences was proposed. A pseudo-random number sequence, generated by a
hyper-chaos system, is used to determine two involved encryption functions,
bitwise exclusive or (XOR) operation and modulo addition. It was reported that
the scheme can be broken with some pairs of chosen plain-images and the
corresponding cipherimages. This paper re-evaluates the security of the
encryption scheme and finds that the encryption scheme can be broken with only
one known plain-image. The performance of the known-plaintext attack, in terms
of success probability and computation load, become even much better when two
known plain-images are available. In addition, security defects on
insensitivity of the encryption result with respect to changes of secret key
and plain-image are also reported.

2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an