Patent SG-11201806702X-A (SG)
Title: Personal device security using elliptic curve cryptography for secret sharing
Inventor: WRIGHT CRAIG STEVEN
IPC: H04L9/32
Filed: 2017-02-14
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 31 August 2017 (31.08.2017) WI PO I PCT (10) International Publication Number WO 2017/145002 Al 111111111111110111010101111101011111011101011111100111111101011111111111110111111 ODD / 5 (51) International Patent Classification: GO6Q 20/38 (2012.01) HO4L 9/32 (2006.01) H04L 9/30 (2006.01) H04L 9/08 (2006.01) (21) International Application Number: PCT/IB2017/050815 (22) International Filing Date: 14 February 2017 (14.02.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 1603117.1 23 February 2016 (23.02.2016) GB 1603122.1 23 February 2016 (23.02.2016) GB 1619301.3 15 November 2016 (15.11.2016) GB (71) Applicant: NCHAIN HOLDINGS LIMITED [AG/AG]; Fitzgerald House, 44 Church Street, St. John's (AG). (72) Inventors: WRIGHT, Craig Steven; c/o Urquhart-Dykes & Lord LLP, 7th Floor Churchill House, Churchill Way, Cardiff CF10 2HH (GB). SAVANAH, Stephane; c/o Ur- quhart-Dykes & Lord LLP, 7th Floor Churchill House, Churchill Way, Cardiff CF10 2HH (GB). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3)) = (54) Title: PERSONAL DEVICE SECURITY USING ELLIPTIC CURVE CRYPTOGRAPHY FOR SECRET SHARING (57) : A method (400) of encrypting data at an elec- tronic device (3) where the electronic device is associated with a key device (5). Each device is associated with an asymmetric cryptography pair, each pair including a first private key and a first public key. Respective second private and public keys may be determined based on the first private key, first public key and a deterministic key. A secret may be determined based on the second private and public keys. The data at the electronic device (3) may be encrypted using the --25 determined secret or an encryption key that is based on the 23 zs secret. Information indicative of the deterministic key may be sent to the key device (5) where the information may be stored. 14 13 11 15 W O 20 17 / 145 00 2 Al Eavesdropper Fig. 1