(19)

(11)

EP 3 935 782 A1

(12)

(43) Date of publication: 12.01.2022 Bulletin 2022/02 (21) Application number: 20712741.6 (22) Date of filing: 18.02.2020

(51) International Patent Classification (IPC):  H04L 9/32(2006.01) H04L 29/06(2006.01) (52) Cooperative Patent Classification (CPC): H04L 9/3218; H04L 63/0428; H04L 9/3239; H04L 2209/38; H04L 63/12 (86) International application number: PCT/US2020/018685 (87) International publication number: WO 2020/180487 (10.09.2020 Gazette 2020/37)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 05.03.2019 US 201962814167 P 18.06.2019 US 201916444903 18.06.2019 US 201916444582 (71) Applicant: HRL Laboratories, LLC Malibu, CA 90265 (US)	(72) Inventors: LAMPKINS, Joshua, D. Gardena, CA 90249 (US) KIM, Hyun (Tiffany) J. Irvine, CA 92602 (US) (74) Representative: Boult Wade Tennant LLP  Salisbury Square House 8 Salisbury Square London EC4Y 8AP London EC4Y 8AP (GB)