Encryption method based on pseudo random spatial light modulation for single-fibre data transmission

Kowalski, Marcin; Życzkowski, M.

doi:10.1016/j.optcom.2017.06.046

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Signal encryption is particularly important for secure signal transmission in the communication field. [ 50 ] Benefiting from the high sensitivity of the NPTs, a promising application as UV light encoders is explored. Figure a shows the schematic diagram of light encryption process of the UV light encoder.…”

Section: Resultsmentioning

confidence: 99%

Negative Phototransistors with Ultrahigh Sensitivity and Weak‐Light Detection Based on 1D/2D Molecular Crystal p–n Heterojunctions and their Application in Light Encoders

et al. 2022

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Anomalous negative phototransistors in which the channel current decreases under light illumination hold potential to generate novel and multifunctional optoelectronic applications. Although a variety of design strategies have been developed to construct such devices, NPTs still suffer from far lower device performance compared to well‐developed positive phototransistors (PPTs). In this work, a novel 1D/2D molecular crystal p–n heterojunction, in which p‐type 1D molecular crystal (1DMC) arrays are embedded into n‐type 2D molecular crystals (2DMCs), is developed to produce ultrasensitive NPTs. The p‐type 1DMC arrays act as light‐absorbing layers to induce p‐doping of n‐type 2DMCs through charge transfer under illumination, resulting in ineffective gate control and significant negative photoresponses. As a result, the NPTs show remarkable performances in photoresponsivity (P) (1.9 × 108) and detectivity (D*) (1.7 × 1017 Jones), greatly outperforming previously reported NPTs, which are one of the highest values among all organic phototransistors. Moreover, the device exhibits intriguing characteristics undiscovered in PPTs, including precise control of the threshold voltage by controlling light signals and ultrasensitive detection of weak light. As a proof‐of‐concept, the NTPs are demonstrated as light encoders that can encrypt electrical signals by light. These findings represent a milestone for negative phototransistors, and pave the way for the development of future novel optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Negative Phototransistors with Ultrahigh Sensitivity and Weak‐Light Detection Based on 1D/2D Molecular Crystal p–n Heterojunctions and their Application in Light Encoders

et al. 2022

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“…As for encryption of time-varying signals, the spatial DRPE technique and its variations need time-to-space and space-totime coupling [19][20][21][22][23], or conversion of time-varying signals to spatial images [24], which induces relatively larger system complexity, insertion loss, and performance instability than pure time-domain schemes. Fortunately, the space-time duality [25] provides a framework to design temporal counterparts [26][27][28][29] of those spatial optical encryption schemes specifically for protection of time-varying signals, by replacing thin lenses, free-space diffractions, and plane masks with time lenses, dispersion elements, and time masks, respectively.…”

Section: Introductionmentioning

confidence: 99%

An anamorphic time-lens-based optical cryptosystem for protection of time-varying signals

Wang¹,

Lou²

2020

J. Opt.

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The similarity between in-plane directions of spatial optics and overlapped time ranges of temporal optics is introduced as a new rule of the space–time duality. Applying this rule, an optical dual random phase encoding (DRPE) cryptosystem in the temporal anamorphic fractional Fourier transform (TAFrFT) domain is proposed for physical-level protection of time-varying signals. The structure of a TAFrFT system is an anamorphic time lens (ATL) sandwiched by two identical dispersion elements. The additional key provided by a TAFrFT system is only related to phase profile of the involved ATL, leading to a dispersion-independent manner of key updating as well as an enlarged key space (KS) in comparison with the conventional temporal FrFT and Fresnel transform system. This manner of key updating has potential as a one-time key strategy to evade the intrinsic linearity and symmetry weakness of DRPE-like temporal cryptosystems, due to the updating speed being comparable to the frame rate of plaintext signals. As the temporal counterpart of a spatial optical device composed of cylindrical lenses along different directions, an ATL is designed as an equal-spaced array of time lenses with unipolar phase, constant extension, and varying phase height. Implemented by an arbitrary waveform generator (AWG)-driven electro-optic phase modulator (EOPM), the time interval of adjacent time lenses, extension of each time lens, and the standard phase height are optimally designed as functions of the AWG bandwidth B M and the EOPM damage phase threshold Γ 0 . By numerical simulations, a 16-slot input optical Gaussian pulse sequence with half pulse width of 10 ps and frame length of 2000 ps is encrypted with a KS near 2 698 provided by ATLs at parameters B M = 100 GHz and Γ 0 = 5 π radians under the state of the art, enough for resistance to brute-force attacks.

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“…Most of these applications perform over public networks, while some of these data are effective or very important in terms of the user point of view [10]. Therefore, security techniques are very important to protect data from unauthorized users [11]. The standard solutions for the data security are cryptography and steganography.…”

Section: Introductionmentioning

confidence: 99%

A New and Adaptive Security Model for Public Communication Based on Correlation of Data Frames

et al. 2019

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Recent developments in communication and information technologies, plus the emerging of the Internet of Things (IoT) and machine to machine (M2M) principles, create the need to protect data from multiple types of attacks. In this paper, a secure and high capacity data communication model is proposed to protect the transmitted data based on identical frames between a secret and cover data. In this model, the cover data does not convey any embedded data (as in normal steganography system) or modify the secret message (as in traditional cryptography techniques). Alternatively, the proposed model sends the positions of the cover frames that are identical with the secret frames to the receiver side in order to recover the secret message. One of the significant advantages of the proposed model is the size of the secret key message which is considerably larger than the cover size, it may be even hundred times larger. Accordingly, the experimental results demonstrate a superior performance in terms of the capacity rate as compared to the traditional steganography techniques. Moreover, it has an advantage in terms of the required bandwidth to send the data or the required memory for saving when compared to the steganography methods, which need a bandwidth or memory up to 3-5 times of the original secret message. Where the length of the secret key (positions of the identical frames) that should be sent to the receiver increases by only 25% from the original secret message. This model is suitable for applications with a high level of security, high capacity rate and less bandwidth of communication or low storage devices.

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Encryption method based on pseudo random spatial light modulation for single-fibre data transmission

Cited by 5 publications

References 38 publications

Negative Phototransistors with Ultrahigh Sensitivity and Weak‐Light Detection Based on 1D/2D Molecular Crystal p–n Heterojunctions and their Application in Light Encoders

Negative Phototransistors with Ultrahigh Sensitivity and Weak‐Light Detection Based on 1D/2D Molecular Crystal p–n Heterojunctions and their Application in Light Encoders

An anamorphic time-lens-based optical cryptosystem for protection of time-varying signals

A New and Adaptive Security Model for Public Communication Based on Correlation of Data Frames

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