Generalized multi-channel scheme for secure image encryption

Audhkhasi, Romil; Povinelli, Michelle L.

doi:10.1038/s41598-021-02067-8

Cited by 13 publications

(8 citation statements)

References 42 publications

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“…Encryption of intermediate images is performed using our multichannel scheme [ 31 ] and requires two keys (see “Methods” section for information on an additional image randomization step). Each key is characterized by three parameters: n , n p , and n s , which collectively describe the manner in which a given image is converted to cipher images.…”

Section: Resultsmentioning

confidence: 99%

“…We showed in our previous work that the security of the encryption process increases with number of channels. [ 31 ] Future implementations of our multi‐channel encryption scheme may utilize high‐quality factor microstructures to allow for a larger number of wavelength channels to be used. We anticipate that our proposed metasurfaces and multi‐channel encryption scheme will pave the way for next‐generation IR cryptographic systems.…”

Section: Discussionmentioning

confidence: 99%

“…Since the random images can only be transformed back to the original image via a series of mathematical operations described in a key, encryption provides enhanced security over typical image encoding. In our previous work, [ 31 ] we introduced the idea of a generalized key space implicitly defined by mathematical decryption functions. We showed that the size of our key space grows double‐exponentially with the number of wavelength channels, thereby making it increasingly difficult for unauthorized recipients to retrieve the correct key via brute‐force methods.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

Audhkhasi

Lien

Povinelli

2023

Advanced Optical Materials

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The ability to tailor light–matter interactions using artificially engineered materials has opened up new avenues for secure data storage and communication. This work presents an experimental investigation of metasurfaces for secure, multi‐channel image encryption in the infrared (IR). The proposed metasurfaces consist of an array of pixels, each designed to produce a wavelength‐ and polarization‐dependent IR absorptivity. A basis set of pixels is designed for encrypting images of arbitrary resolution on a given number of wavelength and polarization channels. These pixels are fabricated, and their spectral response is experimentally measured using Fourier transform infrared spectroscopy. The measured data is used to emulate the encryption and decryption of binary and 8‐bit grayscale images. Finally, the security of the encryption scheme proposed in this work is evaluated by performing statistical analyses on the image data stored on different channels. The results presented in this study suggest intriguing possibilities for the development of encrypted tagging technologies in the infrared and thus have implications for secure object identification and anti‐counterfeiting.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

Audhkhasi

Lien

Povinelli

2023

Advanced Optical Materials

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“…Throughout the international research status, digital image encryption has become a hot research topic 19 – 22 . In recent years, many scholars have devoted themselves to research in this field and achieved good results.…”

Section: Introductionmentioning

confidence: 99%

High-quality restoration image encryption using DCT frequency-domain compression coding and chaos

Wen

Liu

et al. 2022

Sci Rep

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With the arrival of the age of big data, the amount and types of data in the process of information transmission have increased significantly, and the full-disk encryption mode used by traditional encryption algorithms has certain limitations of the times. In order to further improve the bandwidth efficiency of digital images in the transmission process and the information effectiveness of digital image transmission, this paper proposes an algorithm of high-quality restoration image encryption using DCT frequency-domain compression coding and chaos. Firstly, the image hash value is used for the generation of an encryption key with plaintext correlation, then lightweight chaos is generated based on the key to obtain a pseudo-random sequence. Secondly, the image is partitioned into subblock, and converted from time domain into frequency domain by employing Discrete Cosine Transform (DCT) on each block, then perform quantization operation based on frequency domain information to obtain DCT coefficient matrix. Thirdly, the direct current (DC) coefficients and alternating current (AC) coefficients are extracted in the DCT coefficient matrix and compressed by different encoding methods to obtain two sets of bitstream containing DC coefficient and AC coefficient information. Fourthly, permute the DC coefficient bit stream by the chaotic sequence, and reconstruct it with the AC coefficient bit stream to obtain the frequency domain ciphertext image. Finally, the chaotic sequence is used to diffuse ciphertext, and the processed hash value is hidden in the ciphertext to obtain the final ciphertext. The theoretical and experimental analysis showed that the key length reaches 341 bits, and the PSNR value of the restored image is close to 60, all of which satisfy the theoretical value. Therefore, the algorithm has the characteristics of high compression rate, high-quality image restoration large key space, strong plaintext sensitivity, strong key sensitivity and so on. Our method proposed in this paper is expected to provide a new idea for confidential and secure communication in the age of big data.

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“…We also performed CMT calculations assuming that the only modes that can couple are mode 1 (ω 0 , g 0 x ) and mode 2 (ω 0 + Ω, g 0 x – G ). Using the absorptivity of the unmodulated system, we directly extracted values of γ loss and γ rad for port 1 and port 3. Figure shows a comparison of absorptivity and emissivity calculated numerically and using CMT.…”

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confidence: 99%

Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

et al. 2022

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We present a nonreciprocal thermal emitter based on the dynamic modulation of graphene. A graphene ribbon grating situated on a dielectric slab is designed to excite high-quality resonances in the long-IR region. We show that upon space–time modulation of the Fermi energy of graphene, asymmetric modal splitting results in large nonreciprocity, leading to a strong violation of Kirchhoff’s law of thermal radiation. We further show that the graphene system allows the creation of “absorptivity holes” and “emissivity holes” in the spectrum that are asymmetric. By changing the modulation frequency, the location of these holes can be adjusted, giving rise to a new dimension of tunable thermal emission in nonreciprocal systems. In this system, while Kirchhoff’s law is violated, we numerically observe certain symmetry properties between absorption and emission. We establish that these symmetry properties follow compound symmetry considerations.

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Generalized multi-channel scheme for secure image encryption

Cited by 13 publications

References 42 publications

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

High-quality restoration image encryption using DCT frequency-domain compression coding and chaos

Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

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