A method, system, and non-transitory computer readable medium are described for providing a sender a plurality of ephemeral keys such that a sender and receiver can exchange encrypted communications. Accordingly, a sender may retrieve information, such as a public key and a key identifier, for the first receiver from a local storage. The retrieved information may be used to generate a key-encrypting key that is used to generate a random communication encryption key. The random communication encryption key is used to encrypt a communication, while the key-encrypting key encrypts the random communication key. The encrypted communication and the encrypted random communication key are transmitted to the first receiver.

The present disclosure involves systems, software, and computer implemented methods for a verifiable communication-efficient secret shuffle protocol for encrypted data based on homomorphic encryption. A service provider and multiple clients participate in a secret shuffle protocol of randomly shuffling encrypted client-specific secret input values. The protocol includes generation and exchange of random numbers, random permutations, different blinding values, and use of random secret-shares. A protocol step includes homomorphic operations to shuffle encrypted secret input values so that resulting encrypted secret input values are rerandomized and in a shuffled sequence that is unmapped to an order of receipt by the service provider of the encrypted secret input values.

A system or method for encryption of data includes a light source, a random optical element and a light detection element. The light source is arranged to transmit an input data signal to the random optical element. The light source is incident on the random optical element such that the input data signal is randomly scattered by the random optical element to generate an image at on the detector disposed at an output of the random optical element. The image received by the detector is applied to a compressive sensing algorithm to generate a transfer function. The transfer function defines a relationship between the input data signal and the image to enable estimation and reconstruction of the input data signal.

Encryption and decryption techniques based on one or more transposition vectors. A secret key is used to generate vectors that describe permutation (or repositioning) of characters within a segment length equal to a length of the transposition vector. The transposition vector is then inherited by the encryption process, which shifts characters and encrypts those characters using a variety of encryption processes, all completely reversible. In one embodiment, one or more auxiliary keys, transmitted as clear text header values, are used as initial values to vary the transposition vectors generated from the secret key, e.g., from encryption-to-encryption. Any number of rounds of encryption can be applied, each having associated headers used to “detokenize” encryption data and perform rounds to decryption to recover the original data (or parent token information). Format preserving encryption (FPE) techniques are also provided with application to, e.g., payment processing.

A first address bus may be located in an upper layer of an integrated circuit that is associated with a memory and a memory controller. The first address bus may receive a first portion of a memory address. A second address bus may be located in a lower layer of the integrated circuit where the second address bus is to receive a second portion of the memory address. Furthermore, a data bus may be located in an intermediate layer where the data bus is to receive data corresponding to the memory address from the memory and may transmit the data to the memory controller. The intermediate layer may be between the upper layer and the lower layer. A layout of the signals of the data bus may vertically overlap with a layout of signals of the first address bus and a layout of signals of the second address bus.

Methods, systems, and devices for data processing are described. Some database systems may support differential privacy for encrypted data. For example, a database may store user data as ciphertext. A system may receive a statistical query for the user data and may identify a relevant differential privacy mechanism. The system may transform the query to operate on encrypted data while including a noisification function based on the mechanism. The system may execute the transformed query at the database, involving adding noise to the query result according to the noisification function without decrypting the data. For example, the system may leverage homomorphic encryption techniques to inject the noise while the data remains encrypted. The database may return the noisified, encrypted query results, which the system may decrypt for statistical analysis. By applying differential privacy on the encrypted data, the system may avoid exposing any private user information throughout the process.

Systems and methods for generating min-increment counting bloom filters to determine count and frequency of device identifiers and attributes in a networking environment are disclosed. The system can maintain a set of data records including device identifiers and attributes associated with device in a network. The system can generate a vector comprising coordinates corresponding to counter registers. The system can identify hash functions to update a counting bloom filter. The system can hash the data records to extract index values pointing to a set of counter registers. The system can increment the positions in the min-increment counting bloom filter corresponding to the minimum values of the counter registers. The system can obtain an aggregated public key comprising a public key. The system can encrypt the counter registers using the aggregated shared key to generate an encrypted vector. The system can transmit the encrypted vector to a networked worker computing device.

The invention provides a solution for secure authentication of an individual. The invention comprises methods and apparatus for secure input of a user's identifier e.g. PIN. An image of a keypad is superimposed over an operable keypad within a display zone of a screen associated with an electronic device. The keypad image and/or the operable keypad are generated by the device using a scrambled or randomised keypad configuration generated on or at the electronic device. The configuration or order of keys depicted in the image may or may not be scrambled or randomised. Thus, the order of keys depicted in the image do not correspond to the order of the keys in the operable keypad, so that when the user selects a ‘key’ depicted in the image on the screen, the underlying operable keypad is caused to operate and an encoded version of the user's input is received into memory on the device. The encoded input can be sent for decoding on a remote computer. The keypad configurations used for generation of the operable keypad(s) and/or keypad image(s) are generated using an input. The input could be a true or pseudo random number or biometric data relating to a user of the device. The device may be a mobile phone, a tablet computer, laptop, PC, payment terminal or any other electronic computing device with a screen.

An authentication method and system are provided that is particularly suited for verifying the identity of an individual prior to permitting access to a controlled resource. This may or may not be a financial resource. Biometric data relating to a user is used to encode and decode an identifier associated with a user. Thus, the user's biometric data becomes the key for encoding and subsequently decoding the identifier. In one embodiment, the biometric data is used to generate a keypad configuration. The keypad configuration specifies the order and/or position of a plurality of keypad keys. An operable keypad and/or image of a keypad is then generated using the configuration. Thus, the individual's biometric data can be used to generate a customised keypad and/or image which can then be used to encode or decode the identifier associated with the user. A keypad or image generated from the biometric data can be used to generate a mapping between different keypad configurations. The biometric data may be captured at or on a device associated with the individual, such as a computer, mobile phone, tablet computer etc.

A control circuit causes a first cryptographic module to perform a dummy operation in a command processing period and a data processing period in which a second cryptographic module performs a normal operation while the first cryptographic module does not perform a normal operation.