Journal
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
Volume 57, Issue 12, Pages 3745-3760Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10773-018-3887-z
Keywords
Quantum image encryption algorithm; Random phase transformation; NASS; Key space
Categories
Funding
- National Natural Science Foundation of China [61462026, 61762012, 61762014]
- Project of Science and Technology of Jiangxi province [20161BAB202065]
- key research project of Guangxi Normal University [2016ZD008]
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This paper proposes a quantum image encryption algorithm based on n-qubit normal arbitrary superposition state (NASS) by using the basic scheme of quantum transformation and random phase transformation. According to theoretical analysis and experimental simulation on MATLAB system, we find that key space is an important factor of encryption and decryption algorithm. When the secret key space is large, it is difficult for the attacker to crack the encrypted information. Based on this finding, we perform 2(n) +4 times phase transformation in the encryption process. And each transformation is random, which increases the difficulty of decryption. So there are a total of 2(n) +4 randomly transformed keys. In this paper, we design the implementation circuit of random phase transformation, and because the real quantum computer is not in our grasp, now we use MATLAB software to simulate grayscale image and color image encryption algorithm in classic computer, respectively. And the histogram, complexity and correlation are analyzed. Study shows that the proposed encryption algorithm is valid.
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