公开(公告)号：WO2023059501A1

公开(公告)日：2023-04-13

申请号：PCT/US2022/045252

申请日：2022-09-29

Applicant: VISA INTERNATIONAL SERVICE ASSOCIATION

Inventor： BADRINARAYANAN, Saikrishna ,  PATRANABIS, Sikhar ,  SARKAR, Pratik

IPC: H04L9/08 ,  H04L2209/50 ,  H04L9/3013

Abstract: Methods for performing oblivious transfer are disclosed. These methods include a method for performing random single bit oblivious transfer (a "first method"), a method for performing random string oblivious transfer (a "second method"), and a method for performing non-random string oblivious transfer (a "third method"). In the first method, a sender computer can use a hardcore predicate function to obfuscate either a first message or a second message, generating an obfuscated message. The receiver computer can de-obfuscate this obfuscated message to randomly receive either the first message or the second message. The second method and third method can be implemented, with some modification, by repeatedly performing the first method, once for each "message bit" of the sender's messages. In the second and third methods, the receiver computer can send "indicator bits" to the sender computer, enabling the sender computer to transmit a random or non-random message strings to the receiver..

公开(公告)号：WO2023059495A1

公开(公告)日：2023-04-13

申请号：PCT/US2022/045096

申请日：2022-09-28

Applicant: VISA INTERNATIONAL SERVICE ASSOCIATION

Inventor： BADRINARAYANAN, Saikrishna ,  PATRANABIS, Sikhar ,  SARKAR, Pratik

IPC: H04L9/08 ,  H04L2209/50 ,  H04L9/3013

Abstract: Novel methods of performing statistically receiver private (SRP) string oblivious transfer (OT) are disclosed. Such methods can be used to transfer messages between senders and receivers subject to the conditions of oblivious transfer. These methods can be used as a "building block" to develop useful cryptographic systems, such as multiparty computation networks. A sender computer and a receiver computer can exchange a first and second oblivious transfer message. Data contained in these messages can be used, by the sender computer, to obfuscate a first message and a second message. The sender computer can transmit (in a third oblivious transfer message), both the first obfuscated message, the second obfuscated message and a group element to a receiver computer. Using the group element, the receiver computer can attempt to de-obfuscate one or both of the obfuscated messages, and can receive either a first message or a second message in the process.

公开(公告)号：WO2023009294A1

公开(公告)日：2023-02-02

申请号：PCT/US2022/036528

申请日：2022-07-08

Applicant: VISA INTERNATIONAL SERVICE ASSOCIATION

Inventor： NAGARAJA, Vinjith ,  XU, Minghua ,  PATEL, Karankumar Hiteshbhai ,  GU, Shengfei ,  PATRANABIS, Sikhar ,  BADRINARAYANAN, Saikrishna ,  MUKHERJEE, Pratyay ,  RINDAL, Peter ,  JIN, Shan

IPC: H04L9/08

Abstract: A method performed by a user device is disclosed. The method comprising generating a secret and measuring a biometric template of a user operating the user device. The method then generates a plurality of secret shares of the secret and of the biometric template. The user device then transmits the secret shares of the secret and of the biometric template to a plurality of recovery devices. After, the user device may then initiate a recovery of the secret and measure a biometric measurement of the user. Data of the biometric measurement may be transmitted to the plurality of recovery devices, where the recovery devices perform a partial computation. The user device use the plurality of partial computations to determine a match between the biometric template and the biometric measurement. If the two biometrics match, the user device can reconstruct the secret using shares of the secret from the recovery devices.