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    Enhanced performance of secure multi-party computation
    1.
    发明授权
    Enhanced performance of secure multi-party computation 有权

    公开(公告)号：US12192342B2

    公开(公告)日：2025-01-07

    申请号：US17916871

    申请日：2022-03-07

    Applicant: Google LLC

    Inventor： Gang Wang ,  Sarvar Patel ,  Marcel M. Moti Yung ,  Karn Seth ,  Kevin Wei Li Yeo ,  Benjamin Kreuter ,  Mariana Raykova ,  Tancrède Lepoint

    IPC: H04L9/08

    Abstract: This document relates to using secure MPC to select digital components in ways that preserve user privacy and protects the security of data of each party that is involved in the selection process. In one aspect, a method includes receiving, by a first computing system of a secure MPC system and from a client device, a digital component request and a nonce. The first computing system generates, based on the nonce and a function, an array including a share of a Bloom filter representing user group identifiers for user groups that include a user of the client device as a member. For each of multiple user group identifiers, the first computing system calculates, in collaboration with one or more second computing systems of the secure MPC system and using the array, a respective first secret share of one or more user group membership condition parameters.

    Encrypted search cloud service with cryptographic sharing
    2.
    发明授权
    Encrypted search cloud service with cryptographic sharing 有权

    公开(公告)号：US12141315B2

    公开(公告)日：2024-11-12

    申请号：US18159674

    申请日：2023-01-25

    Applicant: Google LLC

    Inventor： Kevin Yeo ,  Sarvar Patel ,  Giuseppe Persiano

    IPC: H04L29/06 ,  G06F21/62 ,  H04L9/06 ,  H04L9/08 ,  H04L9/32 ,  H04L9/40

    Abstract: A method for sharing read access to a document stored on memory hardware. The method includes receiving a shared read access command from a sharor sharing read access to a sharee for a document stored on memory hardware in communication with the data processing hardware, and receiving a shared read access request from the sharee. The shared read access command includes an encrypted value and a first cryptographic share value based on a write key, a read key, a document identifier, and a sharee identifier. The method also includes multiplying the first and second cryptographic share values to determine a cryptographic read access value. The cryptographic read access value authorizes read access to the sharee for the document. The method also includes storing a read access token for the sharee including the cryptographic read access value and the encrypted value in a user read set of the memory hardware.

    Methods for protecting privacy
    4.
    发明授权
    Methods for protecting privacy 有权

    公开(公告)号：US11962687B2

    公开(公告)日：2024-04-16

    申请号：US17298893

    申请日：2019-12-04

    Applicant: Google LLC

    Inventor： Sarvar Patel ,  Marcel M. M. Yung ,  Gang Wang ,  Karn Seth ,  Mariana Raykova ,  Benjamin R. Kreuter ,  Ananth Raghunathan

    IPC: H04L9/08 ,  H04L9/32

    CPC classification number: H04L9/085 ,  H04L9/0869 ,  H04L9/32 ,  H04L2209/50

    Abstract: A method including at each of a number of client devices receiving a data item, receiving a public key from a second computing system, encrypting the data item using the public key to produce a singly encrypted data item, engaging in an oblivious pseudorandom function protocol with a first computing system using the singly encrypted data item to produce a seed, generating an encrypted secret share using a threshold secret sharing function under which the encrypted secret share cannot be decrypted until a threshold number of encrypted secret shares associated with the same singly encrypted data item are received, and transmitting the encrypted secret share to the first computing system and at the first computing system receiving a number of encrypted secret shares from the number of client devices, processing the number of encrypted secret shares to produce processed data, and transmitting the processed data to a second computing system.

    Response-Hiding Searchable Encryption
    5.
    发明公开
    Response-Hiding Searchable Encryption 审中-公开

    公开(公告)号：US20230274007A1

    公开(公告)日：2023-08-31

    申请号：US18312556

    申请日：2023-05-04

    Applicant: Google LLC

    Inventor： Kevin Yeo ,  Sarvar Patel ,  Giuseppe Persiano

    IPC: G06F21/60 ,  G06F21/62 ,  H04L9/08

    CPC classification number: G06F21/602 ,  G06F21/6227 ,  H04L9/0894 ,  G06F2221/2107 ,  G06F2221/0751

    Abstract: A method for providing response-hiding searchable encryption includes receiving a search query for a keyword from a user device associated with a user. The keyword appears in one or more encrypted documents within a corpus of encrypted documents stored on an untrusted storage device. The method also includes accessing a document oblivious key-value storage (OKVS) to obtain a list of document identifiers associated with the keyword. Each document identifier in the list of document identifiers associated with a respective keyword identifier is concatenated with the keyword and uniquely identifies a respective one of the one or more encrypted documents that the keyword appears in. The method also includes returning the list of document identifiers obtained from the document OKVS to the user device.

    Private Information Retrieval with Sublinear Public-Key Operations
    7.
    发明公开
    Private Information Retrieval with Sublinear Public-Key Operations 审中-公开

    公开(公告)号：US20230185960A1

    公开(公告)日：2023-06-15

    申请号：US18167490

    申请日：2023-02-10

    Applicant: Google LLC

    Inventor： Sarvar Patel ,  Kevin Yeo ,  Giuseppe Persiano

    IPC: G06F21/62 ,  G06F17/16 ,  G06F21/60 ,  H04L9/00

    CPC classification number: G06F21/6245 ,  G06F17/16 ,  G06F21/602 ,  H04L9/008

    Abstract: A method includes initializing a client state on a client device be executing a private batched sum retrieval instruction to compute c sums O of data blocks from an untrusted storage device. Each computed sum O stored on memory hardware of the client device and including a sum of a corresponding subset S of exactly k data blocks. The method also includes a query instruction to retrieve a query block Bq stored on the untrusted storage device by iterating through each of the c sums O of data blocks to identify one of the c sums O that does not include the query block Bq, instructing a service to pseudorandomly partition the untrusted storage device into partitions and sum the data blocks in each partition to determine a corresponding encrypted data block sum.

    ENHANCED PERFORMANCE OF SECURE MULTI-PARTY COMPUTATION
    9.
    发明公开
    ENHANCED PERFORMANCE OF SECURE MULTI-PARTY COMPUTATION 审中-公开

    公开(公告)号：US20230155820A1

    公开(公告)日：2023-05-18

    申请号：US17916871

    申请日：2022-03-07

    Applicant: Google LLC

    Inventor： Gang Wang ,  Sarvar Patel ,  Marcel M. Moti Yung ,  Karn Seth ,  Kevin Wei Li Yeo ,  Benjamin Kreuter ,  Mariana Raykova ,  Tancrède Lepoint

    IPC: H04L9/08

    CPC classification number: H04L9/085 ,  H04L2209/466

    Abstract: This document relates to using secure MPC to select digital components in ways that preserve user privacy and protects the security of data of each party that is involved in the selection process. In one aspect, a method includes receiving, by a first computing system of a secure MPC system and from a client device, a digital component request and a nonce. The first computing system generates, based on the nonce and a function, an array including a share of a Bloom filter representing user group identifiers for user groups that include a user of the client device as a member. For each of multiple user group identifiers, the first computing system calculates, in collaboration with one or more second computing systems of the secure MPC system and using the array, a respective first secret share of one or more user group membership condition parameters.

    Privately querying a database with private set membership using succinct filters
    10.
    发明授权
    Privately querying a database with private set membership using succinct filters 有权

    公开(公告)号：US11621828B1

    公开(公告)日：2023-04-04

    申请号：US17448565

    申请日：2021-09-23

    Applicant: Google LLC

    Inventor： Kevin Yeo ,  Joon Young Seo ,  Sarvar Patel

    IPC: H04L29/06 ,  H04L9/06 ,  G06F21/62

    Abstract: A method includes obtaining, from a server, a filter including a set of encrypted identifiers each encrypted with a server key controlled by the server. The method includes obtaining a request that requests determination of whether a query identifier is a member of a set of identifiers corresponding to the set of encrypted identifiers. The method also includes transmitting an encryption request to the server that requests the server to encrypt the query identifier. The method includes receiving, from the server, an encrypted query identifier including the query identifier encrypted by the server key and determining, using the filter, whether the encrypted query identifier is not a member of the set of encrypted identifiers. When the encrypted query identifier is not a member of the set of encrypted identifiers, the method includes reporting that the query identifier is not a member of the set of identifiers.

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