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    Error correcting schemes for keyless encryption
    41.
    发明授权
    Error correcting schemes for keyless encryption 有权

    公开(公告)号：US11799674B2

    公开(公告)日：2023-10-24

    申请号：US17542118

    申请日：2021-12-03

    Applicant: Arizona Board of Regents on Behalf of Northern Arizona University

    Inventor： Bertrand F Cambou ,  Fatemeh Afghah ,  Sareh Assiri ,  Ashwija Korenda

    IPC: H04L9/32 ,  H04L9/08

    CPC classification number: H04L9/3278 ,  H04L9/0869 ,  H04L9/3242

    Abstract: Systems and methods of correcting errors in encrypted communication between a server and client devices using keyless encryption schemes are disclosed. Client devices with arrays of physical-unclonable-function devices respond to challenges from a server. Characteristics of the arrays are stored by the server during a secure enrollment process. To send an encrypted message, the server generates a message digest, extracts data from the stored arrays on the basis of the message digest, applies error correction codes to the message, encrypts the message with the extracted data, and sends the message to a client. The server may receive a handshake containing all or part of the message digest, measures its PUF, and decrypts and decodes the message.

    Fast cryptographic key generation from memristor-based physical unclonable computed functions
    45.
    发明授权
    Fast cryptographic key generation from memristor-based physical unclonable computed functions 有权

    公开(公告)号：US11736305B2

    公开(公告)日：2023-08-22

    申请号：US17221180

    申请日：2021-04-02

    Applicant: Arizona Board of Regents on Behalf of Northern Arizona University

    Inventor： Bertrand F Cambou

    IPC: H04L9/32 ,  G06F11/10

    CPC classification number: H04L9/3278 ,  G06F11/1044

    Abstract: Systems and methods for symmetric encryption between a client and a server device include a client device having an array of physical unclonable function devices and a server device storing information sufficient to reconstruct responses of the devices to an applied stimulus such as varying levels of electrical current. The server shares a challenge with the client, which measures characteristics such as electrical resistances for a subset of the devices according to instructions extracted from the challenge. The client measures a corresponding reference device in the array for each device of the subset and assigns a value determined based on a comparison of each device with the corresponding reference device to generate a cryptographic key. The server calculates an expected response of the client to the challenge according to a model of the devices in the array, and uses the calculated response to generate the key independently.

    PUF with dissolvable conductive paths
    50.
    发明授权
    PUF with dissolvable conductive paths 有权

    公开(公告)号：US11552810B2

    公开(公告)日：2023-01-10

    申请号：US16493263

    申请日：2018-07-20

    Applicant: Arizona Board of Regents on Behalf of Northern Arizona University

    Inventor： Bertrand Francis Cambou ,  Raul Chipana Quispe ,  Bilal Babib

    IPC: H04L9/32 ,  G06F21/60 ,  G11C13/00

    Abstract: The generation of “fingerprints”, also called challenge-response pairs (CRPs) of Physically Unclonable Functions (PUFs), can often stress electronic components, leaving behind traces that can be exploited by crypto-analysts. A non-intrusive method to generate CRPs based on Resistive RAMs may instead be used, which does not disturb the memory cells. The injection of small electric currents (magnitude of nanoAmperes) in each cell causes the resistance of each cell to drop abruptly by several orders of magnitudes through the formation of temporary conductive paths in each cell. A repeated injection of currents into the same cell, results in an almost identical effect in resistance drop for a single cell. However, due to the small physical variations which occur during manufacturing, the cells are significantly different from each other, in such a way that a group of cells can be used as a basis for PUF authentication.

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