KEY DISTRIBUTION FOR A PHYSICAL UNCLONABLE ENCRYPTION SYSTEM

    公开(公告)号:US20240007451A1

    公开(公告)日:2024-01-04

    申请号:US18039730

    申请日:2021-12-01

    Applicant: BASF SE

    Abstract: A method for distributing symmetric encryption keys in a communication system comprising a plurality of nodes is disclosed. Each node comprises information about printer control settings and printer jobs and a printing device configured for generating encryption keys. The method comprises: providing to each node an initial session key information that comprises an initial printer control setting and an initial printer job setting; providing to each node as a one-time pad an initial session key package encrypted with the initial session key information and comprising items of first session key information, wherein any two nodes have a common item of first session key information; generating at each node second session key information that is different for each of the other nodes; and sending from one of the nodes to another node a message encrypted with the first session key information and comprising the second session key information.

    ELECTROMAGNETIC WAVES ABSORBING MATERIAL
    187.
    发明公开

    公开(公告)号:US20240006775A1

    公开(公告)日:2024-01-04

    申请号:US18038304

    申请日:2021-11-26

    Applicant: BASF SE

    CPC classification number: H01Q17/004 H01Q17/007 C08K7/06 C08K2201/001

    Abstract: The present invention relates to an electromagnetic millimetre wave absorber material, preferably having a volume resistivity of more than 1 Ωcm, containing solid particles having an aspect ratio (length:diameter) of at least 5 of a first electrically conductive material, particles having an aspect ratio (length:diameter) of less than 5 of a second electrically conductive material and an electrically non-conductive polymer, wherein the absorber material is preferably capable of absorbing electromagnetic waves in a frequency region of 60 GHz to 200 GHz and wherein the electromagnetic millimetre wave absorber material comprises based on the total amount of the absorber material from 30 wt.-% to 93 wt.-% of the electrically non-conductive polymer, from 6.5 wt.-% to 10 wt.-% of the first electrically conductive material, from 0.5 wt.-% to 0.9 wt.-% of the second electrically conductive material, and from 0 wt.-% to 59.1 wt.-% of one or more additives. The invention also relates to its use and method for absorbing as well as a sensor apparatus comprising said absorber material.

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