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    Caller ID verification using call identification and block lists
    21.
    发明授权
    Caller ID verification using call identification and block lists 有权

    公开(公告)号：US10715660B2

    公开(公告)日：2020-07-14

    申请号：US16595168

    申请日：2019-10-07

    Applicant: PINDROP SECURITY, INC.

    Inventor： Payas Gupta ,  Terry Nelms, II

    IPC: H04M1/66 ,  H04M3/436 ,  H04W12/06 ,  H04W4/16 ,  H04M3/42

    Abstract: In an illustrative embodiment, a user device may block all the phone numbers used by an enterprise. When an enterprise wants to call the user, the enterprise may notify the user device through a separate secure channel that an enterprise phone number is in the process of making a phone call to the user device. The secure channel may include an authentication server that may request the user device to unblock the enterprise phone number. An incoming phone call from the enterprise phone number therefore can be trusted. After the phone call is terminated, the user device may again block the enterprise phone number. An attacker may not have access to the authentication server and a phone call from the attacker with a spoofed enterprise phone number (now blocked) may be dropped by the user device.

    END-TO-END SPEAKER RECOGNITION USING DEEP NEURAL NETWORK
    23.
    发明申请
    END-TO-END SPEAKER RECOGNITION USING DEEP NEURAL NETWORK 审中-公开

    公开(公告)号：US20190392842A1

    公开(公告)日：2019-12-26

    申请号：US16536293

    申请日：2019-08-08

    Applicant: PINDROP SECURITY, INC.

    Inventor： Elie KHOURY ,  Matthew GARLAND

    IPC: G10L17/08 ,  G06N3/08 ,  G06N3/04 ,  G10L17/22 ,  G10L17/18 ,  G10L15/16 ,  G10L17/04 ,  G10L17/02

    Abstract: The present invention is directed to a deep neural network (DNN) having a triplet network architecture, which is suitable to perform speaker recognition. In particular, the DNN includes three feed-forward neural networks, which are trained according to a batch process utilizing a cohort set of negative training samples. After each batch of training samples is processed, the DNN may be trained according to a loss function, e.g., utilizing a cosine measure of similarity between respective samples, along with positive and negative margins, to provide a robust representation of voiceprints.

    AUTHENTICATION USING DTMF TONES
    24.
    发明申请
    AUTHENTICATION USING DTMF TONES 审中-公开

    公开(公告)号：US20190387096A1

    公开(公告)日：2019-12-19

    申请号：US16551327

    申请日：2019-08-26

    Applicant: PINDROP SECURITY, INC.

    Inventor： Payas GUPTA

    IPC: H04M3/38 ,  H04M3/51 ,  H04L29/06

    Abstract: A method of obtaining and automatically providing secure authentication information includes registering a client device over a data line, storing information and a changeable value for authentication in subsequent telephone-only transactions. In the subsequent transactions, a telephone call placed from the client device to an interactive voice response server is intercepted and modified to include dialing of a delay and at least a passcode, the passcode being based on the unique information and the changeable value, where the changeable value is updated for every call session. The interactive voice response server forwards the passcode and a client device identifier to an authentication function, which compares the received passcode to plural passcodes generated based on information and iterations of a value stored in correspondence with the client device identifier. Authentication is confirmed when a generated passcode matches the passcode from the client device.

    System and method for cluster-based audio event detection
    25.
    发明授权
    System and method for cluster-based audio event detection 有权

    公开(公告)号：US10141009B2

    公开(公告)日：2018-11-27

    申请号：US15610378

    申请日：2017-05-31

    Applicant: PINDROP SECURITY, INC.

    Inventor： Elie Khoury ,  Matthew Garland

    IPC: G10L25/45 ,  G10L25/51 ,  G10L25/27 ,  G10L25/78

    Abstract: Methods, systems, and apparatuses for audio event detection, where the determination of a type of sound data is made at the cluster level rather than at the frame level. The techniques provided are thus more robust to the local behavior of features of an audio signal or audio recording. The audio event detection is performed by using Gaussian mixture models (GMMs) to classify each cluster or by extracting an i-vector from each cluster. Each cluster may be classified based on an i-vector classification using a support vector machine or probabilistic linear discriminant analysis. The audio event detection significantly reduces potential smoothing error and avoids any dependency on accurate window-size tuning. Segmentation may be performed using a generalized likelihood ratio and a Bayesian information criterion, and the segments may be clustered using hierarchical agglomerative clustering. Audio frames may be clustered using K-means and GMMs.

    AUTHENTICATION USING DTMF TONES
    27.
    发明申请
    AUTHENTICATION USING DTMF TONES 审中-公开

    公开(公告)号：US20180205822A1

    公开(公告)日：2018-07-19

    申请号：US15872639

    申请日：2018-01-16

    Applicant: PINDROP SECURITY, INC.

    Inventor： Payas GUPTA

    IPC: H04M3/38 ,  H04M3/51 ,  H04M3/42

    CPC classification number: H04M3/382 ,  H04L63/0838 ,  H04L63/18 ,  H04M3/42008 ,  H04M3/493 ,  H04M3/5166 ,  H04M2203/6072 ,  H04M2203/6081

    Abstract: A method of obtaining and automatically providing secure authentication information includes registering a client device over a data line, storing information and a changeable value for authentication in subsequent telephone-only transactions. In the subsequent transactions, a telephone call placed from the client device to an interactive voice response server is intercepted and modified to include dialing of a delay and at least a passcode, the passcode being based on the unique information and the changeable value, where the changeable value is updated for every call session. The interactive voice response server forwards the passcode and a client device identifier to an authentication function, which compares the received passcode to plural passcodes generated based on information and iterations of a value stored in correspondence with the client device identifier. Authentication is confirmed when a generated passcode matches the passcode from the client device.

    TELECOMMUNICATIONS VALIDATION SYSTEM AND METHOD
    30.
    发明申请
    TELECOMMUNICATIONS VALIDATION SYSTEM AND METHOD 有权

    公开(公告)号：US20250039295A1

    公开(公告)日：2025-01-30

    申请号：US18913429

    申请日：2024-10-11

    Applicant: Pindrop Security, Inc.

    Inventor： MohammedAli MERCHANT ,  Matthew WILLIAMS ,  Tim PRUGAR

    IPC: H04M3/22 ,  H04M3/42

    Abstract: According to an embodiment of the disclosure, a toll-free telecommunications validation system determines a confidence value that an incoming phone call to an enterprises' toll-free number is originating from the station it purports to be by incorporating one or more layers of signals and data in determining said confidence value. The data and signals can include one or more call identifiers and/or toll-free call routing logs, service control point (SCP) signals and data, service data point (SDP) signals and data, dialed number information service (DNIS) signals and data, session initiation protocol (SIP) signals and data, carrier identification code (CIC) signals and data, location routing number (LRN) signals and data, jurisdiction information parameter (JIP) signals and data, charge number (CN) signals and data, billing number (BN) signals and data, and originating carrier information (such as information derived from the ANI).

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