Patent AU-2018348317-A1 (AU)
Title: Blockchain data protection using homomorphic encryption
Inventor: MA BAOLI
IPC: H04L9/00
Filed: 2018-11-07
Abstract: (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property (1) Organization11111111111111111111111I1111111111111i1111liiiii International Bureau (10) International Publication Number (43) International Publication Date W O 2019/072264 A2 18 April 2019 (18.04.2019) W IPO I PCT (51) InternationalPatent Classification: (81) Designated States (unless otherwise indicated, for every Not classified kind ofnational protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, (21)InternationalApplicationNumber: CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, PCT/CN2018/114344 DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, HN, (22) International Filing Date: HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, 07 November 2018 (07.11.2018) 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, (25)FilingOLanguage: English M, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, (26) Publication Language: English SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, (71) Applicant: ALIBABA GROUP HOLDING LIMITED TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. [-/CN]; Fourth Floor, One Capital Place, P.O. Box 847, (84) Designated States (unless otherwise indicated, for every George Town, Grand Cayman (KY). kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, (72)Inventors:MA,Baoli;AlibabaGroupLegalDepartment5/ UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, F, Building 3, No.969 WestWenYi Road, Yuhang District, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, Hangzhou, Zhejiang 311121 (CN). ZHANG, Wenbin; Al- EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, ibaba Group Legal Department 5/F, Building 3, No.969 MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, West Wen Yi Road, Yuhang District, Hangzhou, Zhejiang TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, 311121 (CN). KM, ML, MR, NE, SN, TD, TG). (74) Agent: BEIJING BESTIPR INTELLECTUAL PROP ERTY LAW CORPORATION; Room 409, Tower B, Ka Wah Building, No. 9 Shangdi 3rd Street, Haidian District, Beijing 100085 (CN). (54) Title: BLOCKCHAIN DATA PROTECTION USING HOMOMORPHIC ENCRYPTION (57) Abstract: Implementations of the present disclosure include receiving, 300 from a first account, a digitally signed copy of a commitment value of a first amount of a transaction amount generated based on a first random number, the first amount of the balance transfer and the first random number encrypt userinouL 30OCKCi 304 ed using a public key of the first account, a second amount of the balance transfer and a second random number encrypted using a public key of the 306 second account, and a set of values generated based on one or more selected ______Gene annacorinftmentv -if :~a c sa bsea r r nn random numbers. The first account determines if the first amount and the enryptbonaseznidnurn errg ,iic a;ft-eir e Aand 3 inrancfriniLsa piec;er me3 Bsecond amount are the same and if the first random number and the second 308 random number are the same based on the set of values, and updates the bal Generating one ror rangeprofs ance of the first account and a balance of the second account based on the 310 first amount of the balance transfer. Generatnga setofalues based onone ormoreseleted ,ando mners Usinga privae keyoftsenodeA fordigtsgnatre - 314 Deterini gte irsrgle , Cop :c rIairinetom b Vergth e nte s t ue tfe one 2e,'4Forangep'oo% o 322 .siding acnQb2 ar~es0. I o~ cer9~ __ FIG. 3 W O 2019/072264 A211111I|II|I||||I|I|||1|11 |||||||DI ||I|II|I|I||||||||||||||||||||||||||||| Published: - upon request of the applicant, before the expiration of the time limit referred to in Article 21(2)(a) - without international search report and to be republished upon receipt of that report (Rule 48.2(g))