Infosys Limited

Vijayaraghavan Varadharajan

Rajarathnam Nallusamy

Kulvaibhav Kaushik

Sanjoy Paul

Sachin Mehta

Umberto Borso

Aditya Bothra

Sivakumar Kuppusamy

Sagar Joglekar

Vipul Jain

A method of enhanced hybrid quantum-classical computing mechanism for solving optimization problems is disclosed comprising altering a value of a configuration chromosome by storing an angle memory on a shared classical memory. The angle memory corresponds to a predefined configuration chromosome. The method then generates a state vector based on the angle memory and reinitializes a quantum circuit from the state vector. Subsequently, generating at least two most probable configuration chromosome from the reinitialized quantum circuit corresponding to a superposition of qubits in a position chromosome. Subsequently selecting one of the at least two most probable configuration chromosomes for each position chromosome after evaluation by a fitness function.

Method and system of enhanced hybrid quantum-classical computing mechanism for solving optimization problems

The present invention relates to a computer-implemented method, system and computer readable medium for searching over encrypted keywords in a database. The method includes the steps of generating at least one keyword, generating a plurality of different encrypted keywords corresponding to the keyword, storing the at least one encrypted keyword in the database, generating a plurality of different trapdoors for the keyword, verifying the plurality of different trapdoors with the plurality of different encrypted keywords corresponding to the keyword, and determining the keyword is found if the plurality of different trapdoors match with one the encrypted keyword corresponding to the keyword, otherwise determining the keyword is not found.

Searching over encrypted keywords in a database

A method and system for a multi-user searchable encryption system over ordered keywords is disclosed. The system includes a key generation server which issues a primary key to a user terminal device and a secondary key to a proxy server. A trapdoor is sent by the user terminal and received by the proxy server. The trapdoor is encrypted at the proxy server. The proxy server receives cypher text from the user terminal and sends the cypher text to the database server. A search keyword inputted by the user at the user terminal is used to perform a lookup in encrypted data.

Keyword ordered storage, search and retrieval on encrypted data for multiuser scenario

An embodiment for securely accessing services of a service provider based on single sign on. The user device is authenticated by an authentication server if the computed hash of the first random number r is same as the received hash of the first random number r sent by a user device. Thereafter, the second random number y, the user id and an element Q are encrypted using a service provider password and send to the service provider. The user device computes a first discrete exponential function Z using the element Q and the second random number y and sends along with the user id to the service provider. The service provider computes a second discrete exponential function Z' using the element Q and the second random number y received from the authentication server and provides the user device access to the services if Z is equal to Z&#x2032;.

Method and system for securely accessing different services based on single sign on

The present invention relates to a computer-implemented method, system and computer readable medium for embedding a watermark into a video and extracting a watermark from the original or copy of the watermarked video. The method comprises converting a video frame from RGB color space to YUV color space. Divide a chrominance component into plurality of blocks. Select plurality of blocks based on size of watermark. Associate a pixel in the watermark with selected plurality of blocks. Embed the watermark corresponding to selected plurality of blocks wherein embedding comprises replacing a first pixel value of the block with maximum value of first column of the block if binary value of the corresponding watermark pixel is one or else replace with minimum value. Combine Y component and chrominance components resulting processed YUV video frame and convert it to RGB video frame. Extract the watermark substantially in a reverse process.

Method, system, and computer-readable medium for embedding and extracting a watermark in a video

A method for performing transcoding resistant watermarking of digital media content is provided. The method enables obtaining a plurality of spectral frequency bands of the digital media content. The method further enables calculating an entropy value for each of the plurality of spectral frequency bands. The entropy value quantifies information in each of the plurality of spectral frequency bands. The method further enables selecting a spectral frequency band from amongst the plurality of spectral frequency bands based on the calculation. The selected spectral frequency band has the highest entropy. Furthermore, the method enables inserting a watermark in the selected spectral frequency band of the digital media content.

Growing community of inventors

Salem, India

Vijayaraghavan Varadharajan