Microsoft Technology Licensing, LLC

Eko India Financial Services Pvt. Ltd.

Raghav Bhaskar

Prasad G Naldurg

Sandeep P Karanth

Balasubramanyan Ashok

Satyanarayana V Lokam

Ajay Manchepalli

Saurabh Panjwani

Abhishek Sinha

Anupam Varghese

Abhinav Sinha

The present invention describes a method for authenticating a user of a mobile device by a verification authority, by making use of at least a personal identification number (PIN) and at least one cryptographic key, such that the PIN and the cryptographic key is known only to the user and the verification authority. The cryptographic key has at least one session key. Firstly, the user encodes the PIN by using at least one session key and then transfers the encoded PIN to a predefined address of the verification authority via the mobile device. Next, the verification authority decodes the PIN by using the cryptographic key authenticates the user if the decoded PIN matches a PIN stored corresponding to the user.

Authentication method and device

A method and system for cryptographically indexing, searching for, and retrieving documents is provided. In some embodiments, an encryption system is provided that generates a document index that allows users to retrieve documents by performing encrypted queries for keywords associated with the documents. In some embodiments, each keyword maps to the same number of encrypted document identifiers. In some embodiments, an extractor graph is employed to map an indication of each keyword to a number of buckets storing encrypted document identifiers. In some embodiments, an order-preserving encryption system is provided. The encryption system uses an ordered index that maps encrypted instances of ordered attribute values to documents that are associated with those values. The ordered index enables queries containing query operators that rely on order, such as less than ('&#x3c;') or greater than ('&#x3e;'), to be successfully performed on encrypted attribute values.

Techniques for representing keywords in an encrypted search index to prevent histogram-based attacks

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Bengaluru, India

Raghav Bhaskar