A system may include a first conductive plate configured at least to receive an input signal and a second conductive plate configured at least to output an output signal. The system may further include a first memristor material positioned between the first conductive plate and the second conductive plate. The system may further include a second memristor material positioned between the first conductive plate and the second conductive plate. The first memristor material and the second memristor material may be in parallel electrically. The first memristor material may be different from the second memristor material.

Systems and methods performed for generating authentication information for an image using optical computing are provided. When a user takes a photo of an object, an optical authentication system receives light reflected and/or emitted from the object. The system also receives a random key from an authentication server. The system converts the received light to plenoptic data and uploads it to the authentication server. In addition, the system generates an optical hash of the received light using the random key, converts the generated optical hash to a digital optical hash, and uploads the digital optical hash to the authentication server. When the authentication server receives the upload, it verifies whether the time of the upload is within a certain threshold time from the sending of the random key and whether the digital optical hash was generated from the same light as the plenoptic data.

According to the chaotic communication method and system based on complex modified projective difference function synchronization provided in the present invention, when a chaotic signal has a relatively small amplitude, the amplitude of the chaotic signal can be adjusted by adjusting a proportional matrix, so as to mask plaintext better. Moreover, a robust controller is designed according to a filtered signal and a second coupling function, to ensure complex modified projective difference function synchronization, and such synchronization allows the bit error rate to be zero theoretically. In addition, complex modified projective difference function synchronization does not require a transmitter and a receiver to be exactly consistent, provided that the synchronization can be implemented under the effect of the controller, thereby solving the disadvantage in the prior art that the receiver system and transmitter system are required to have exactly identical structures, and simplifying a structure requirement on the communication system.

A cryptography system comprises a noising engine and a de-noising engine. The noising engine is configured to receive a key pattern, determine a final membership value based on one or more input parameters and a first knowledge base, and generate a noised key pattern based on the key pattern and the final membership value. The de-noising engine is configured to receive the noised key pattern and the final membership value, and generate a de-noised key pattern based on the noised key pattern, the final membership value, and a second knowledge base.

A data diode provides a flexible device for collecting data from a data source and transmitting the data to a data destination using one-way data transmission across a main channel. On-board processing elements allow the data diode to identify automatically the type of connectivity provided to the data diode and configure the data diode to handle the identified type of connectivity. Either or both of the inbound and outbound side of the data diode may comprise one or both of wired and wireless communication interfaces. A secure reverse channel, separate from the main channel, allows carefully predetermined communications from the data destination to the data source.

Systems and methods for azimuthal multiplexing using three-dimensional diffractive optics An azimuthal optical multiplexing system includes a light source. The system includes two or more at least partially transparent plates. Each plate of the two or more plates has a structured or patterned surface positioned in an optical path of the light source. The system includes means for rotating at least one plate of the two or more plates axially with respect to at least one other plate of the two or more plates. The means for rotating is operatively coupled to the at least one plate. The structured or patterned surface is configured to modulate light directed along the optical path and through the two or more plates.

A data diode provides a flexible device for collecting data from a data source and transmitting the data to a data destination using one-way data transmission across a main channel. On-board processing elements allow the data diode to identify automatically the type of connectivity provided to the data diode and configure the data diode to handle the identified type of connectivity. Either or both of the inbound and outbound side of the data diode may comprise one or both of wired and wireless communication interfaces. A secure reverse channel, separate from the main channel, allows carefully predetermined communications from the data destination to the data source.

The invention relates to a method for coding information symbols of an alphabet into random acoustic signals. The coding dictionary is constructed in a heuristic manner by acquiring a set of random signals, by filtering same by way of the equivalent filter of the transmission channel, by selecting subsets of these signals, and, for each subset, by calculating the correlation matrix of the selected signals, the coding dictionary being constituted by the subset for which the correlation matrix most closely resembles a diagonal matrix. The invention also relates to a method for transmitting and receiving information symbols by way of acoustic signals.

Provided are methods and systems for invalidating user security tokens. An example method may include providing, by one or more nodes in a cluster, a list of revoked security tokens. The method may include receiving, by the one or more nodes, an indication of invalidating a user security token associated with a user device. The indication may include a request from the user to invalidate the user security token. The method may further include, in response to the receiving, adding, by the one or more nodes, the user security token to the list of revoked security tokens. The user security token can be added to the list of revoked security tokens prior to the expiration time of the user security token. The method may further include replicating, by the one or more nodes, the list of revoked security tokens between further nodes of the cluster.

A secure communication method and an apparatus performing the same are disclosed. The communication method includes receiving a signal encrypted based on at least one attractor and decrypting a security signal received using a neural network trained based on a training signal.