2019, Krasnov, V. V., Ryabcev, I. P., Shifrina, A. V., Шифрина, Анна Владимировна

© OSA 2019 © 2019 The Author(s)Lensless encryption scheme with spatially incoherent illumination is presented. Encoding diffraction optical element was designed to form desired light distribution in photosensor plane under spherically diverging illumination. Validity is supported by results of optical experiments.

2024, Zlokazov, E. Y., Minaeva, E. D., Rodin, V. G., Starikov, R. S., Cheremkhin, P. A., Shifrina, A. V., Злоказов, Евгений Юрьевич, Родин, Владислав Геннадьевич, Стариков, Ростислав Сергеевич, Черёмхин, Павел Аркадьевич, Шифрина, Анна Владимировна

2021, Шифрина, А. В., Шифрина, Анна Владимировна, Стариков, Р. С.

2015, Шифрина, А. В., Шифрина, Анна Владимировна, Стариков Сергей Николаевич

2021, Cheremkhin, P. A., Evtikhiev, N. N., Krasnov, V. V., Rodin, V. G., Ryabcev, I. P., Shifrina, A. V., Starikov, R. S., Черёмхин, Павел Аркадьевич, Евтихиев, Николай Николаевич, Родин, Владислав Геннадьевич, Шифрина, Анна Владимировна, Стариков, Ростислав Сергеевич

© 2021 Optical Society of AmericaThe majority of contemporary optical encryption techniques use coherent illumination and suffer from speckle-noise pollution, which severely limits their applicability even when information encoded into special “containers” such as a QR code. Spatially incoherent encryption does not have this drawback, but it suffers from reduced encryption strength due to formation of an unobscured image right on top of the encrypted one by undiffracted light from the encoding diffraction optical element (DOE) in axial configuration. We present a new lensless encryption scheme, experimentally implemented with two liquid crystal spatial light modulators, that does not have this disadvantage because of a special encoding DOE design, which forms desired light distribution in the photosensor plane under spherically diverging illumination without a converging lens. Results of optical experiments on encryption of QR codes and successful information retrieval from decoded images are presented. Conducted analysis of encryption strength demonstrates sufficiently high key sensitivity and large enough key space to resist any brute force attacks.

2017, Шифрина, А. В., Шифрина, Анна Владимировна, Краснов Виталий Вячеславович

2022, Cheremkhin, P., Evtikhiev, N., Krasnov, V., Ryabcev, I., Shifrina, A., Starikov, R., Черёмхин, Павел Аркадьевич, Евтихиев, Николай Николаевич, Шифрина, Анна Владимировна, Стариков, Ростислав Сергеевич

© 2021 by the authors. Licensee MDPI, Basel, Switzerland.The necessity of the correction of errors emerging during the optical encryption process led to the extensive use of data containers such as QR codes. However, due to specifics of optical encryption, QR codes are not very well suited for the task, which results in low error correction capabilities in optical experiments mainly due to easily breakable QR code’s service elements and byte data structure. In this paper, we present optical implementation of information optical encryption system utilizing new multilevel customizable digital data containers with high data density. The results of optical experiments demonstrate efficient error correction capabilities of the new data container.

2024, Rymov,D.A., Shifrina,A.V., Cheremkhin,P.A., Ovchinnikov,A.S., Krasnov,V.V., Starikov,R.S., Рымов, Дмитрий Андреевич, Шифрина, Анна Владимировна, Черёмхин, Павел Аркадьевич, Овчинников, Андрей Сергеевич, Стариков, Ростислав Сергеевич

2021, Шифрина, А. В., Шифрина, Анна Владимировна, Стариков Ростислав Сергеевич

2020, Evtikhiev, N. N., Krasnov, V. V., Starikov, R. S., Shifrina, A. V., Евтихиев, Николай Николаевич, Стариков, Ростислав Сергеевич, Шифрина, Анна Владимировна

© 2020, Allerton Press, Inc.Abstract: A multi-factor model of an optical encryption system with spatially incoherent illumination is proposed. This model takes into account the influence of the recording photosensor noise, changes in image resoltion during transmission through the optical system, spurious illumination, and noise from the synthesis of the encryption diffraction optical element on the quality of the decoded image. It is shown that the proposed model correlates well with the optical experiment (the deencryption error differs by no more than 6%).