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arXiv:quant-ph/0604143

Ghost imaging protocol with intense correlated fields for efficient encryption

E. Puddu, Ivo Pietro Degiovanni, Alessandra Andreoni, Maria Bondani, Stefania Castelletto

Published Apr 19, 2006• 0 citations
arXivHTMLPDF

Abstract

We present a proof of principle of a straightforward application of distributed imaging to the efficient encryption of images. The basic idea is to exploit, in a ghost-imaging experiment, the correlations of the fields produced by a chaotically seeded parametric downconversion to deduce a Code for reconstructing the image of the object. As we demonstrate that this Code is smaller than the entire image size, we suggest that this technique can be used for more efficient image encryption by any quantum key. PACS numbers: 42.50.-p, 42.65.Lm, 03.67.Dd, 03.67.Hk Quantum key distribution (QKD) is a direct application of fundamental quantum mechanics, involving two parties, Alice and Bob, exchanging some classical information. By QKD Alice and Bob share secret random keys to implement a secure encryption-decryption algorithm (one-time-pad) without meeting, and the security of the distributed keys is based on the laws of quantum physics [1]. However at variance with classical communication

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We present a proof of principle of a straightforward application of distributed imaging to the efficient encryption of images. The basic idea is to exploit, in a ghost-imaging experiment, the correlations of the fields produced by a chaotically seeded parametric downconversion to deduce a Code for reconstructing the image of the object. As we demonstrate that this Code is smaller than the entire image size, we suggest that this technique can be used for more efficient image encryption by any quantum key. PACS numbers: 42.50.-p, 42.65.Lm, 03.67.Dd, 03.67.Hk Quantum key distribution (QKD) is a direct application of fundamental quantum mechanics, involving two parties, Alice and Bob, exchanging some classical information. By QKD Alice and Bob share secret random keys to implement a secure encryption-decryption algorithm (one-time-pad) without meeting, and the security of the distributed keys is based on the laws of quantum physics [1]. However at variance with classical communication
As a computational imaging technology, computational ghost imaging has shown considerable potential for applications in many fields such as secure communication and remote sensing detection. However, the bucket detection value of traditional ghost imaging systems is prone to eavesdropping or tampering during transmission, resulting in information leakage or image distortion. In order to further enhance the security during the imaging process, this paper proposes a scheme for computing ghost imaging based on quantum key encryption. This method uses MATLAB simulation to generate random speckle values and bucket detection values. At the sending end, a QKD system is used to generate a truly random quantum key. The bucket detection value is encrypted using the one-time pad encryption algorithm, and the ciphertext and speckle values are sent to the receiving end through a classical channel; At the receiving end, the bucket detection value is decrypted using the corresponding quantum key, and the reconstruction of the target image is completed by combining the speckle value. Experiments have shown that the encrypted bucket detection value has extremely high security during transmission, and the quality of the decrypted reconstructed image can be measured by the peak signal-to-noise ratio. When the key is accurate, it can reach over 33dB, which is basically consistent with the results obtained from unencrypted imaging.
We present experiments of χ (2) difference-frequency processes at frequency degeneracy in regime of high intensity. In the first experiment, we exploit ghost-imaging in the context of quantum cryptography in an attempt to overcome the limitation of the quantum key distribution of keys as long as the image. The code to be encrypted is the string of the power values measured by Alice in the test arm. In the second experiment, we generate frequency down-converted images that are chaotic as, at each laser shot, both the field at 2ω illuminating the object to be imaged and the seed-field at ω are made pseudo-thermal in space. The images are recovered from the recorded chaotic ones by correlating the local intensity fluctuations with those of the seed-field Fourier components. Calculating the correlations in parallel with many Fourier components allows image retrieval by averaging on ensembles of fewer recorded images.
Abstract Quantum Key Distribution (QKD) is one type of Quantum Cryptography (QC) which is based on quantum mechanics fundamentals such as Heisenberg’s uncertainty principle and No-cloning theory. The usage of QKD warns the legitimate communicated parties to any attack attempt and this is the most interesting security parameter. Therefore, QKD provides unconditional secure communication method and supports a powerful encryption scheme. The combination between classical communication and QKD creates a new technique called semi quantum key distribution SQKD. Unfortunately, SQKD increases the schemes complexity and requires two steps for ciphering, scramble and encryption. In this paper an enhance image encryption algorithm is proposed based on QKD that eliminates most of the drawbacks of SQKD. The proposed algorithm is simpler than other encryption schemes as it exploits only one encryption step based on the power and the randomness of the generated secret key, which decreases the chance to be cracked. The correctness and efficiency of the proposed algorithm are validated by numerical simulations.
Computational ghost imaging (CGI) is a method of acquiring object information by measuring light field intensity, which would be used to achieve imaging in a complicated environment. The main issue to be addressed in CGI technology is how to achieve rapid and high-quality imaging while assuring the secure transmission of detection data in practical distant imaging applications. In order to address the mentioned issues, this paper proposes a remote secure CGI method based on quantum communication technology. Using the quantum key distribution (QKD) network, the CGI system can be reconstructed while solving the problem of information security transmission between the detector and the reconstructed computing device. By exploring the influence of different random measurement matrices on the quality of image reconstruction, it is found that the randomness of the numerical sequence constituting the matrix is positively correlated with the imaging quality. Based on this discovery, a new type of quantum cryptography measurement matrix is constructed using quantum cryptography with good randomness. In addition, through further orthogonalization and normalization of the matrix, the matrix has both good randomness and orthogonality, and high-quality imaging results can be obtained at a low sampling rate. The feasibility and effectiveness of the method are verified by simulation imaging experiments. Compared with the traditional GI system, the method proposed in this paper has higher transmission security and high-quality imaging under this premise, which provides a new idea for the practical development of CGI technology.
An optical encryption scheme based on a ghost imaging system with disordered speckles is proposed to obtain a higher security with a small key. In the scheme, Alice produces the random speckle patterns and obtains the detection results with the help of a computational ghost imaging (CGI) system. Then Alice permutes the order of the random speckle patterns and shares the permutation sequence as a secure key to the authorized users. With the secure key, Bob could recover the object with the principle of the CGI system, whereas, the unauthorized users could not obtain any information of the object. The numerical simulations and experimental results show that the proposed scheme is feasible with a small key, simultaneously, it has a higher security. When the eavesdropping ratio (ER) is less than 40%, the eavesdropper cannot acquire any useful information. Meanwhile, the authorized users could recover completely with the secure key.