Publications / Journals / Conferences |
International Journal:
- R. Kumar, N. K. Nishchal, and A. Alfalou, “Wavelet-modified segmented phase-only filter for in-plane rotated object recognition,” Physica Scripta 99 (2024) 085538.
- R. Kumar, P. Kumar, N. K. Nishchal, and A. Alfalou, “Image authentication with exclusive-OR operated optical vortices,” Journal of Optical Society of America A 41 (2024) 1365-1371.
- M. Baliyan and N. K. Nishchal, “Optical cryptography with C-point vector beams,” Optics and Lasers in Engineering 180 (2024) 108337.
- S. K. Rao and N. K. Nishchal, “Asymmetric multi-image encoding and hiding scheme with structured fingerprint phase masks using gyrator transform and phase-shifting digital holography,” Journal of Optics 26 (2024) 075701.
- A. Pal, Jyothish M., and N. K. Nishchal, “Estimation of distance and rotation with an optical correlator,” IEEE Photonics Technology Letters 36 (2024) 689-692.
- A. Shikder, J. B. Mohapatra, and N. K. Nishchal, “Fractional topological charge measurement through optical correlation,” Optics Letters 49 (2024) 2017-2020
- M. Baliyan and N. K. Nishchal, “Determining topological charge of Bessel-Gaussian beams using modified Mach-Zehnder interferometer,” MDPI Photonics 11 (2024) 263.
- A. Shikder, S. K. Rao, P. Kumar, and N. K. Nishchal, “Binary image encryption with QR code-encoded optical beam having array of vortices,” Journal of Optical Society of America A 41 (2024) A72-A82.
- M. Baliyan, P. Kumar, and N. K. Nishchal, “Image encryption through dualpass modulated azimuthally polarized vector field,” IEEE Photonics Technology Letters 36 (2024) 313-316.
- S. K. Rao, N. K. Nishchal, and A. AlFalou, “Optical asymmetric image encryption using vectorial light field encoding,” Optics Communications 554 (2024) 130097.
- R. Kumar, A. Shikder, N. K. Nishchal, and A. AlFalou, “Topological charge identification of vortex beams through optical correlation,” IEEE Photonics Technology Letters 35 (2023) 1315-1318.
- S. K. Rao and N. K. Nishchal, “Optical asymmetric cryptosystem for multiple image encryption through vector field encoding,” Applied Physics B: Lasers and Optics 129 (2023)
- R. Kumar, N. K. Nishchal, and A. AlFalou, “Improving the false alarm capability of the extended maximum average correlation height filter,” MDPI Photonics 10 (2023) 1096.
- M. Baliyan, A. Shikder, and N. K. Nishchal, “Generation of structured light beams by a dual phase modulation with a single spatial light modulator,” Physica Scripta 98 (2023) 105528.
- A. Shikder and N. K. Nishchal, “Image encryption using binary polarization states of light beam,” Scientific Reports 13 (2023) 14028.
- M. Baliyan and N. K. Nishchal, “Generating scalar and vector modes of Bessel beams utilizing holographic axicon phase with spatial light modulator,” Journal of Optics 25 (2023) 095702.
- A. Shikder and N. K. Nishchal, “Generation of optical vortex lattices by in-line phase modulation with partially coherent light,” Journal of Optical Society of America A 40 (2023) 1231-1236.
- A. Shikder and N. K. Nishchal, “Measurement of fractional topological charge of optical vortex beam through interference fringe dislocation,” Applied Optics 62 (2023) D58-D67.
- I. Mehra and N. K. Nishchal, “Fingerprint image encryption using phase retrieval algorithm in gyrator wavelet transform domain using QR decomposition,” Optics Communications 533 (2023) 129265.
- A. Shikder, P. Kumar, and N. K. Nishchal, "Image encryption by structured phase encoding and its effectiveness in turbulent medium," IEEE Photonics Technology Letters 35 (2023) 128-131.
- P. Kumar, N. K. Nishchal, T. Omatsu, and A. S. Rao, “Self-referenced interferometry for single-shot detection of vector-vortex beams,” Scientific Reports 12 (2022) 17253.
- P. Kumar, N. K. Nishchal, and A. AlFalou, “Color image encryption using vectorial light field through a compact optical set-up,” Journal of Optics 24 (2022) 064017.
- P. Kumar, N. K. Nishchal, and A. AlFalou, “Controllable optical vortex array for image encoding,” IEEE Photonics Technology Letters 34 (2022) 521-524.
- P. Kumar, N. K. Nishchal, T. Omatsu, and A. S. Rao, “Optical vortex array for two-dimensional exclusive-OR operation,” Applied Physics B: Lasers and Optics 128 (2022) 98.
- P. Kumar and N. K. Nishchal, “Phase response optimization of a liquid crystal spatial light modulator with partially coherent light,” Applied Optics 60 (2021) 10795-10801.
- A. Kumar, R. K. Jha, and N. K. Nishchal, “A multi-exposure fusion framework for contrast enhancement of hazy images employing dynamic stochastic resonance,” Journal of Visual Communication and Image Representation 81 (2021) 103376.
- A. Kumar, R. K. Jha, and N. K. Nishchal, “Dynamic stochastic resonance and image fusion based model for quality enhancement of dark and hazy images,” Journal of Electronic Imaging 30 (2021) 063008.
- P. Kumar and N. K. Nishchal, “Formation of singular light fields using phase calibrated spatial light modulator,” Optics and Lasers in Engineering 146 (2021) 106720.
- A. Kumar, R. K. Jha, and N. K. Nishchal, “A joint Gamma correction and multi-resolution fusion scheme for enhancing haze degraded images,” Optical Engineering 60 (2021) 063103.
- A. Kumar, R. K. Jha, and N. K. Nishchal, “A modified Gamma correction model for image dehazing in a multi-exposure fusion framework,” Journal of Visual Communication and Image Representation 78 (2021) 103122.
- A. K. Gupta and N. K. Nishchal, “Low-light phase imaging using in-line digital holography and transport of intensity equation,” Journal of Optics 23 (2021) 025701.
- A. K. Gupta, P. Kumar, N. K. Nishchal, and A. Al Falou, “Polarization-encoded fully-phase encryption using transport of intensity equation,” MDPI Electronics 10 (2021) 00969.
- P. Kumar and N. K. Nishchal, “Array formation of optical vortices using in-line phase modulation,” Optics Communications 493 (2021) 127020.
- P. Kumar, A. Fatima, and N. K. Nishchal, “Arbitrary vector beam encoding using single modulation for information security for information security applications,” IEEE Photonics Technology Letters 33 (2021) 243-246.
- P. Kumar, S. K. Pal, N. K. Nishchal, and P. Senthilkumaran, "Formation of polarization singularity lattice through dual-phase modulation,"Journal of Optics 22 (2020) 115701.
- A. K. Gupta, R. Mahendra, and N. K. Nishchal, “Single-shot phase imaging based on transport of intensity equation,” Optics Communications 477 (2020) 126347.
- P. Kumar, S. K. Pal, N. K. Nishchal, and P. Senthilkumaran,“Non-interferometric technique to realize vector beams embedded with polarization singularities,” Journal of Optical Society of America A 37 (2020) 1043-1052.
- A. K. Gupta, A. Fatima, N. K. Nishchal, and T. Nomura, “Phase imaging based on modified transport of intensity equation using liquid crystal variable retarder with partial incoherent illumination,” Optical Review 27 (2020) 142-148.
- A. K. Gupta, N. K. Nishchal, and P. P. Banerjee, “Transport of intensity equation based photon counting phase imaging,” OSA Continuum 3 (2020) 236-245.
- P. Kumar and N. K. Nishchal, “Self-referenced interference of laterally displaced vortex beams for topological charge determination,” Optics Communications 459 (2020) 125000.
- P. Kumar and N. K. Nishchal, “Self-referenced spiral interferogram using modified lateral shearing Mach-Zehnder interferometer,” Applied Optics 58 (2019) 6827-6833.
- P. Kumar and N. K. Nishchal, “Modified Mach-Zehnder interferometer for determining high-order topological charge of Laguerre-Gaussian vortex beams,” Journal of Optical Society of America A 36 (2019) 1447-1455.
- P. Kumar, A. Fatima, and N. K. Nishchal, “Image encryption using phase-encoded exclusive-OR operations with incoherent illumination,” Journal of Optics 21 (2019) 065701.
- P. Kumar and N. K. Nishchal, “Enhanced exclusive-OR and quick response code-based image encryption through incoherent illumination,” Applied Optics 58 (2019) 1408-1412.
- A. Kumar and N. K. Nishchal, “Quick response code and interference-based optical asymmetric cryptosystem,” Journal of Information Security and Applications 45 (2019) 35-43.
- T. Pitkaaho, V. Pitkakangas, M. Niemela, S. K. Rajput, N. K. Nishchal, and T. J. Naughton, Space-variant video compression and processing in digital holographic microscopy sensor networks with application to potable water monitoing, Applied Optics 57 (2018) E190-E198.
- A. Kumar, A. Fatima, and N. K. Nishchal, An optical Hash function construction based on equal modulus decomposition for authentication verification, Optics Communications 428 (2018) 07-14.
- A. Fatima and N. K. Nishchal, Image authentication using vector beam with sparse phase information, Journal of Optical Society of America A 35 (2018) 1053-1062.
- Yatish, A. Fatima and N. K. Nishchal, Optical image encryption using triplet of functions, Optical Engineering 57 (2018) 033103.
- A. Fatima and N. K. Nishchal, Optical image security using Stokes polarimetry of spatially variant polarized beam, Optics Communications 417 (2018) 30-36.
- I. Mehra, A. Fatima and N. K. Nishchal, Gyrator wavelet transform, IET Image Processing 12 (2018) 432-437.
- R. Kumar, B. Bhaduri, and N. K. Nishchal, "Nonlinear QR code based optical image encryption using spiral phase transform, equal modulus decomposition and singular value decomposition," Journal of Optics 20 (2018) 015701.
- S. K. Rajput and N. K. Nishchal, “Optical asymmetric cryptosystem based on photon counting and phase-truncated Fresnel transforms,” Journal of Modern Optics 64 (2017) 878-886.
- S. K. Rajput and N. K. Nishchal, “Optical double image security using random phase fractional Fourier domain encoding and phase retrieval algorithm,” Optics Communications 388 (2017) 38-46.
- D. Kumar and N. K. Nishchal, “Synthesis and reconstruction of multi-plane phase-only Fresnel holograms,” Optik 127 (2016) 12069-12077.
- A. Fatima and N. K. Nishchal, “Discussion on comparative analysis and a new attack on optical asymmetric cryptosystem,” Journal of Optical Society of America A 33 (2016) 2034-2040.
- B. Javidi, A. Carnicer, M. Yamaguchi, T. Nomura, E. Perez-Cabre, M. S.Millan, N. K. Nishchal, R. Torroba, J. F. Barrera, W. He, X. Peng, A. Stern, Y. Rivenson, A. Alfalou, C. Brosseau, C. Guo, J. T. Sheridan, G.Situ, M. Naruse, T. Matsumoto, I. Juvells, E. Tajahuerce, J. Lancis, W. Chen, X. Chen, P. W. H. Pinkse, A. P. Mosk, and A. Markman, “Roadmap on Optical Security,” Journal of Optics 18 (2016) 083001.
- A. Fatima, I. Mehra, and N. K. Nishchal, “Optical asymmetric cryptosystem using equal modulus decomposition and multiple diffractive imaging,” Journal of Optics 18 (2016) 085701.
- D. Kumar and N. K. Nishchal, “Three-dimensional object recognition using joint fractional Fourier transform correlators with the help of digital Fresnel holography,” Optik 126 (2015) 2690-2695.
- I. Mehra and N. K. Nishchal, “Optical asymmetric image encryption using gyrator wavelet transform,” Optics Communications 354 (2015) 344-352.
- D. Kumar and N. K. Nishchal, “Recognition of three-dimensional objects using joint fractional correlator and nonlinear joint fractional correlator with the help of digital Fresnel holography; A comparative study,” Optical Review 22 (2015) 256-263.
- I. Mehra, K. Singh, A. K. Agarwal, U. Gopinathan, and N. K. Nishchal, "Encrypting digital hologram of three-dimensional object using diffractive imaging," Journal of Optics 17 (2015) 035707.
- S. K. Rajput, D. Kumar, and N. K. Nishchal, "Photon counting imaging and phase mask multiplexing for multiple images authentication and digital hologram security," Applied Optics 54 (2015) 1657-1666.
- I. Mehra and N. K. Nishchal, “Optical asymmetric watermarking using modified wavelet fusion and diffractive imaging,” Optics and Lasers in Engineering 68 (2015) 74-82.
- I. Mehra and N. K. Nishchal, “Wavelet-based image fusion for securing multiple images through asymmetric keys,” Optics Communications 335 (2015) 153-160.
- S. K. Rajput, D. Kumar, and N. K. Nishchal, “Photon counting imaging and polarized light encoding for secure image verification and hologram watermarking,” Journal of Optics 16 (2014) 125406.
- S. K. Rajput and N. K. Nishchal, “An optical encryption and authentication scheme using asymmetric keys,” Journal of the Optical Society of America A 31 (2014) 1233-1238.
- Mehra and N. K. Nishchal, “Image fusion using wavelet transform and its application to asymmetric cryptosystem and hiding,” Optics Express 22 (2014) 5474-5482.
- S. K. Rajput and N. K. Nishchal, “Fresnel domain nonlinear image encryption scheme based on Gerchberg-Saxton phase retrieval algorithm,” Applied Optics 53 (2014) 418-425.
- I. Mehra and N. K. Nishchal, “Asymmetric cryptosystem for securing multiple images using two beam interference phenomenon,” Optics and Laser Technology 60 (2014) 1-7.
- I. Mehra, S. K. Rajput, and N. K. Nishchal, “Cryptanalysis of an image encryption scheme based on joint transform correlator with amplitude- and phase-truncation approach,” Optics and Lasers in Engineering 52 (2014) 167-173.
- S. K. Rajput and N. K. Nishchal, “Known-plaintext attack on encryption domain independent optical asymmetric cryptosystem,” Optics Communications 309 (2013) 231-235.
- S. K. Rajput and N. K. Nishchal, “Image encryption using polarized light encoding and amplitude- and phase-truncation in Fresnel domain,” Applied Optics 52 (2013) 4343-4352.
- I. Mehra, S. K. Rajput, and N. K. Nishchal, “Collision in Fresnel domain asymmetric cryptosystem using phase truncation and authentication verification,” Optical Engineering 52 (2013) 028202.
- S. K. Rajput and N. K. Nishchal, “Known-plaintext attack-based optical cryptosystem using phase-truncated Fresnel transform,” Applied Optics 52 (2013) 871-878.
- S. K. Rajput and N. K. Nishchal, “Image encryption and authentication verification scheme using fractional nonconventional joint transform correlator,” Optics and Lasers in Engineering 50 (2012) 1474-1483.
- S. K. Rajput and N. K. Nishchal, “Asymmetric color cryptosystem that uses polarization selective diffractive optical element and structured phase mask,” Applied Optics 51 (2012) 5377-5386.
- S. K. Rajput and N. K. Nishchal, “Image encryption based on interference that uses fractional Fourier domain asymmetric keys,” Applied Optics 51(2012) 1446-1452
- N. K. Nishchal, “Hierarchical encrypted image watermarking using fractional Fourier domain random phase encoding,” Optical Engineering 50 (2011) 097003.
- N. K. Nishchal and T. J. Naughton, “Flexible optical encryption with multiple users and multiple security levels,” Optics Communications 284 (2011) 735-739.
- N. K. Nishchal, “Optical asymmetric crytposystems,” Regional Conference on Radio Science (RCRS-2020), Feb. 12-14, 2020, IIT BHU Varanasi [Invited].
- A. K. Gupta and N. K. Nishchal, “Transport of intensity equation for phase imaging,” 20th Int’l. Symp. on Optomechatronic Technologies (ISOT-2019), Nov. 11-13, 2019, Goa [Invited].
- P. Kumar and N. K. Nishchal, “Self-referenced interferogram of Laguerre-Gaussian beams for topological charge determination,” 20th Int’l. Symp. on Optomechatronic Technologies (ISOT-2019), Nov. 11-13, 2019, Goa.
- P. Kumar, A. Kumar, and N. K. Nishchal, “LED-based implementation of exclusive-OR operation for securing QR code,” Int’l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL-2019), Oct. 19-22, 2019, IRDE Dehradun [Invited].
- A. Fatima and N. K. Nishchal, “Denoising imaging polarimetry by total variation reduction,” Int’l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL-2019), Oct. 19-22, 2019, IRDE Dehradun.
- A. Kumar, R. K. Jha, and N. K. Nishchal, “A weighted multi-scale fusion technique for single image haze removal,” Int’l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL-2019), Oct. 19-22, 2019, IRDE Dehradun.
- P. Kumar and N. K. Nishchal, “Self-referenced interferometric technique for determining high-order topological charges of vortex beams,” Int’l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL-2019), Oct. 19-22, 2019, IRDE Dehradun.
- A. K. Gupta and N. K. Nishchal, “Transport of intensity based photon counting phase imaging for non-invasive applications,” Int’l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL-2019), Oct. 19-22, 2019, IRDE Dehradun.
- A. K. Gupta, A. Fatima, and N. K. Nishchal, “Single shot transport of intensity equation based phase imaging using refractive index variation,” M5B.4, OSA Topical Meeting on Digital Holography and 3D Imaging (DH-2019), May 19-23, 2019, Bordeaux, FRANCE.
- A. K. Gupta and N. K. Nishchal, “Phase imaging based on transport of intensity equation using liquid crystal variable waveplate,” M5B.7, OSA Topical Meeting on Digital Holography and 3D Imaging (DH-2019), May 19-23, 2019, Bordeaux, FRANCE.
- P. Kumar and N. K. Nishchal, “Optical cryptosystems with quick response code,” Information Photonics-2019(IP-19), April 24-26, 2019, Yokohama, JAPAN [Invited].
- N. K. Nishchal, “Securing information through light,” Int’l. Confer. on Photonics, Metamaterials, and Plasmonics (PMP-2019), Feb. 14-16, 2019, JIIT Noida [Invited].
- P. Kumar, A. Fatima, and N. K. Nishchal, “Multiple image security scheme based on Stokes parameter of spatially varying polarized beam,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2018), Dec. 12-15, 2018, IIT Delhi.
- A. K. Gupta and N. K. Nishchal, “A non-interferometric phase retrieval using liquid crystal spatial light modulator,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2018), Dec. 12-15, 2018, IIT Delhi.
- A. Kumar and N. K. Nishchal, “A multispectral image fusion technique based on single level integer wavelet transform,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2018), Dec. 12-15, 2018, IIT Delhi.
- Yatish, A. Fatima, and N. K. Nishchal, “Two-stage optical hierarchical authentication based on interference with sparse phase information,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2018), Dec. 12-15, 2018, IIT Delhi.
- A. Fatima and N. K. Nishchal,“Image encryption by phase and polarization modulation of light,” 7th Bihar Science Conference, An Int’l. Confer. on Science & Technology (BSC-2018), Dec. 04-06, 2018, College of Commerce, Arts, and Science, Patna.
- N. K. Nishchal, “Vector beam with required phase-only functions for asymmetric image encryption,” XLII Annual Meeting of the Optical Society of India-Int’l. Symp. on Optics (OSI-ISO-2018), Sept. 19-22, 2018, IIT Kanpur [Invited].
- P. Kumar and N. K. Nishchal, “Generation of optical angular momentum of light using liquid crystal spatial light modulator,” XLII Annual Meeting of the Optical Society of India-Int’l. Symp. on Optics (OSI-ISO-2018), Sept. 19-22, 2018, IIT Kanpur.
- A. K. Gupta and N. K. Nishchal, “Phase retrieval with liquid crystal variable retarder based on reference-less non-interferometric technique,” XLII Annual Meeting of the Optical Society of India-Int’l. Symp. on Optics (OSI-ISO-2018), Sept. 19-22, 2018, IIT Kanpur.
- A. Fatima and N. K. Nishchal, “Simultaneous authentication verification of multiple secured images using joint transform correlation approach,” SPIE Security + Defence, Electro-optical and Infrared Systems: Technology and Applications, Sept. 10-13, 2018, Berlin, GERMANY.
- N. K. Nishchal, “Optical asymmetric encryption schemes and attack analysis,” SPIE Security + Defence, Electro-optical and Infrared Systems: Technology and Applications, Sept. 10-13, 2018, Berlin, GERMANY.
- A. Fatima, N. K. Nishchal, Y. Queo, A. Alfalou, and C. Brosseau, “Polarization-based encoding for optical cryptosystems,” 2nd Joensuu Confer. on Coherence & Random Polarization; Trends in Electromagentic Coherence (COHERENCE-2018), June 12-15, 2018, Joensuu, FINLAND.
- A. Fatima, N. K. Nishchal, A. Alfalou, and C. Brosseau, “Securing image authentication using a vector beam analysis,” 2nd Joensuu Confer. on Coherence & Random Polarization; Trends in Electromagentic Coherence (COHERENCE-2018), June 12-15, 2018, Joensuu, FINLAND.
- R. Shekhar, G. Unnikrishnan, and N. K. Nishchal, “Reconstruction quality improvement of digital holograms using multi-scale globa search,” JW4A.8 Digital Holography and 3D Imaging (Topical meeting), OSA Imaging and Applied Optics Congress, June 25-28, 2018, Orlando, Florida, USA.
- R. Shekhar, G. Unnikrishnan, and N. K. Nishchal, “Multiplexing multiple digital holograms for efficient transmission and recovery,” JM4A.33 Digital Holography and 3D Imaging (Topical meeting), OSA Imaging and Applied Optics Congress, June 25-28, 2018, Orlando, Florida, USA.
- A. K. Gupta and N. K. Nishchal, “Phase characterization of a liquid crystal spatial light modulator,” 3rd Int’l. Confer. on Microwave and Photonics (ICMAP-2018), Feb. 09-11, 2018, IIT (ISM) Dhanbad, pp. 37.
- A. Kumar and N. K. Nishchal, “An image encryption scheme using quick response code,” 3rd Int’l. Confer. on Microwave and Photonics (ICMAP-2018), Feb. 09-11, 2018, IIT (ISM) Dhanbad, pp. 48.
- N. K. Nishchal, “Optical security,” Workshop on Recent Advances in Photonics (WRAP-2017), Dec. 18-19, 2017, Mahindra Ecole Centrale, Hyderabad [Invited].
- A. Kumar and N. K. Nishchal, “A noise induced cryptographic hash function based on double random gyrator domain phase encoding,” Int’l. Confer. on Advances in Optics & Photonics (ICAOP-2017), Nov. 23-26, 2017, Hisar.
- A. Fatima and N. K. Nishchal, “Information security through polarization encoding,” Int’l. Confer. on Advances in Optics & Photonics (ICAOP-2017), Nov. 23-26, 2017, Hisar [Invited].
- A. Fatima and N. K. Nishchal, “Phase modulation based optical asymmetric image encryption,” OSA Frontiers in Optics + Laser Science APS/DLS (FiO+LS 2017), Sept. 17-21, 2017, Washington, USA.
- T. Pitkaaho, V. Pitkakangas, M. Niemela, S. K. Rajput, N. K. Nishchal, and T. J. Naughton, “Digital holographic sensor network and image analyses for distributed potable water monitoring,” Irish Machine Vision and Image Processing Conference (IMVIP-2017), Aug. 30-Sept. 01, 2017, Maynooth Univ., IRELAND.
- N. K. Nishchal, “Optical encryption schemes,” UEM Congress 2017, Disruptive Technology & Disruptive Innovation – A Renaissance in this Century, Aug. 16-18, 2017, Sasin Graduate Institute of Business Administration, Cholalongkorn University, Bangkok, THAILAND [Invited].
- A. Kumar and N. K. Nishchal, “Quick response code-based asymmetric image encryption scheme,” Int’l. Topical Meeting on Applied and Adaptive Optics (INTOPMAA-17), Aug. 11-13, 2017, IIST Trivandrum.
- Yatish, A. Fatima and N. K. Nishchal, “Multiple image encryption using unity modulus decomposition,” Int’l. Topical Meeting on Applied and Adaptive Optics (INTOPMAA-17), Aug. 11-13, 2017, IIST Trivandrum.
- A. Fatima and N. K. Nishchal, “Asymmetric optical encryption schemes,” Int’l. Topical Meeting on Applied and Adaptive Optics (INTOPMAA-17), Aug. 11-13, 2017, IIST Trivandrum [Invited].
- T. Pitkaaho, V. Pitkakangas, M. Niemela, S. K. Rajput, N. K. Nishchal, and T. J. Naughton, “Digital holographic microscopy in remote potable water monitoring,” The Digital Holography and 3D Imaging (Topical meeting), May 29-June 01, 2017, Cheju Halla University, Jeju Island, SOUTH KOREA.
- N. K. Nishchal, “Securing 3D information using digital holography,” The Digital Holography and 3D Imaging (Topical meeting), Th1A.2. May 29-June 01, 2017, Cheju Halla University, Jeju Island, SOUTH KOREA [Invited].
- A. Fatima and N. K. Nishchal, “Image encryption using Hartley transform domain polarization encoding,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2016), Dec. 04-08, 2016, IIT Kanpur.
- N. K. Nishchal, “Securing digital holograms through watermarking,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2016), Dec. 04-08, 2016, IIT Kanpur.
- Yatish, A. Fatima and N. K. Nishchal, “Barcode-based watermarking and optical encryption,” The Int’l. Confer. on Fiber Optics and Photonics (PHOTONICS-2016), Dec. 04-08, 2016, IIT Kanpur.
- A. Fatima and N. K. Nishchal, “Asymmetric optical cryptosystem; Attack analysis,” Int’l. Confer. on Light and Light-based Technologies (ICLLT-2016), Nov. 26-28, 2016, Tezpur Univ.
- D. Kumar and N. K. Nishchal, “Digital holography for recognition and information security of 3D objects,” 3rd Int’l. Confer. on Opto-elctronics & Applied Optics (OPTRONIX-2016), Aug. 18-20, 2016, Univ. of Engineering & Management, Kolkata [Invited].
- A. Fatima and N. K. Nishchal, “Single public key dependent attack on optical asymmetric cryptosystem,” 3rd Int’l. Confer. on Opto-elctronics & Applied Optics (OPTRONIX-2016), Aug. 18-20, 2016, Univ. of Engineering & Management, Kolkata.
- N. K. Nishchal, “Optical security for future era,” IEEE 5G Summit, March 29-31, 2016, IIT Patna.
- N. K. Nishchal, “Optical asymmetric cryptosystem and cryptanalysis,” Int’l. Confer. on Opto-Electronics and Applied Optics, (IEEE IEM OPTRONIX-2015) Oct. 16-17, 2015, Univ. of British Columbia, Vancouver, CANADA [Invited].
- D. Kumar and N. K. Nishchal, “Three-dimensional object recognition using phase-only computer-generated Fresnel hologram,” Int’l. Confer. on Opto-Electronics and Applied Optics, (IEEE IEM OPTRONIX-2015) Oct. 16-17, 2015, Univ. of British Columbia, Vancouver, CANADA.
- I. Mehra and N. K. Nishchal, “Optical asymmetric cryptosystem and wavelet based image fusion,” Int’l. Symp. on 3D Imaging, Metrology, Data Security (3DIM-DS 2015), Sept. 26-29, 2015, Shenzen, CHINA [Invited].
- D. Kumar and N. K. Nishchal, “Phase-only computer generated Fresnel hologram synthesis using a symmetrical three-dimensional GS algorithm,” Siegman International School on Lasers: 2015, Aug. 02-07, 2015, Amberg, GERMANY.
- D. Kumar and N. K. Nishchal, “Digital holography based 3D object recognition under varying light illumination using photon counting imaging,” Int’l. Confer. on Digital Holography & 3-D Imaging, May 24-28, 2015, Shanghai Institute of Optics and Fine Mechanics, Shanghai, CHINA.
- I. Mehra and N. K. Nishchal, “Double image encryption using gyrator wavelet transform,” Int’l. Confer. on Optics & Photonics (ICOP-2015), Feb. 20-22, 2015, Univ. of Calcutta.
- D. Kumar, S. K. Rajput, and N. K. Nishchal, “Hologram watermarking with color image via phase multiplexing and photon counting imaging technique,” Int’l. Confer. on Optics & Photonics (ICOP-2015), Feb. 20-22, 2015, Univ. of Calcutta.
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