JP2019537348A - 準同型暗号を使用したブロックチェーンデータ保護 - Google Patents
準同型暗号を使用したブロックチェーンデータ保護 Download PDFInfo
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Abstract
Description
102 パブリックブロックチェーン
106 コンピューティングシステム
108 コンピューティングシステム
110 ネットワーク
202 エンティティレイヤ
204 ホストされたサービスレイヤ
206 パブリックブロックチェーンレイヤ
208 トランザクション管理システム
210 ブロックチェーンインターフェース
212 ブロックチェーンネットワーク
214 ノード
216 ブロックチェーン
302 ユーザノードA
304 ブロックチェーンノード
402 ユーザノードA
406 ユーザノードB
408 ブロックチェーンネットワーク
502 ユーザノードA
504 ブロックチェーンノード
608 ブロックチェーンネットワーク
Claims (12)
- ブロックチェーンネットワークのコンセンサスノードによって実行されるコンピュータ実施方法であって、
第1のアカウントから、第1の乱数に基づいて生成される前記第1のアカウントから第2のアカウントへ移されるべきトランザクション量のコミットメント値のデジタル署名されたコピー、前記第1のアカウントの公開鍵を使用して暗号化される第2の乱数、前記第2のアカウントの公開鍵を使用して暗号化される第3の乱数、1つまたは複数の範囲プルーフ、および1つまたは複数の選択された乱数に基づいて生成される値のセットを受信するステップと、
前記デジタル署名されたコピーに対応するデジタル署名を、前記デジタル署名を生成するために使用される秘密鍵に対応する前記第1のアカウントの公開鍵を使用して検証するステップと、
前記トランザクション量が0より大きく、かつ前記第1のアカウントの残高以下であることを、前記1つまたは複数の範囲プルーフが証明していると決定するステップと、
値の前記セットに基づいて、前記第1の乱数、前記第2の乱数、および前記第3の乱数が同じであるかどうかを決定するステップと、
前記第1の乱数、前記第2の乱数、および前記第3の乱数が同じである場合、前記残高移動の前記量に基づいて前記第1のアカウントの前記残高および前記第2のアカウントの残高を更新するステップとを備える、コンピュータ実施方法。 - 前記コミットメント値が、準同型であるコミットメントスキームを使用して生成される、請求項1に記載のコンピュータ実施方法。
- 前記コミットメントスキームがPedersenコミットメントスキームである、請求項2に記載のコンピュータ実施方法。
- 前記第2の乱数および前記第3の乱数が、HE(a+b)=HE(a)*E(b)かつHE(ab)=HE(b)aという線形の性質を有する決定論的準同型暗号(HE)スキームに基づいて暗号化され、aおよびbがHEに使用されるプレーンテキストである、請求項1に記載のコンピュータ実施方法。
- 前記選択された乱数がr1およびt1によって表され、前記選択された乱数がr2およびt2を生成するために使用され、r2=r1+xr、t2=t1+xtであり、r1およびt1が前記1つまたは複数の選択された乱数を表し、rが前記第1の乱数であり、tが前記残高移動の前記量であり、xがハッシュ値である、請求項4に記載のコンピュータ実施方法。
- 値の前記セットがさらに、T1、T1'、およびT1''に基づいて生成され、T1=gr1ht1、T1'=HE_A(r1)、T1''=HE_B(r1)であり、gおよびhが楕円曲線のジェネレータであり、HE_A(r1)が前記第1のアカウントの前記公開鍵を使用してr1のHEに基づいて生成され、HE_B(r1)が前記第2のアカウントの前記公開鍵を使用してr1のHEに基づいて生成され、xがT1、T1'、およびT1''をハッシュ化することに基づいて生成される、請求項5に記載のコンピュータ実施方法。
- 前記第1の乱数、前記第2の乱数、および前記第3の乱数が、決定論的HEの性質に基づいて同じであると決定される、請求項6に記載のコンピュータ実施方法。
- gr2ht2=TxT1、HE_A(r2)=T'xT1'、かつHE_B(r2)=T''xT1''である場合、前記第1の乱数、前記第2の乱数、および前記第3の乱数が同じであると決定され、T=grht、T'=HE_A(r)、かつT''=HE_B(r)であり、HE_A(r)およびHE_A(r2)がそれぞれ、前記第1のアカウントの前記公開鍵を使用してrおよびr2のHEに基づいて生成され、HE_B(r)およびHE_B(r2)が、前記第2のアカウントの前記公開鍵を使用してrおよびr2のHEに基づいて生成される、請求項6に記載のコンピュータ実施方法。
- T、T'、およびT''が、前記トランザクション量tの暗号文を形成する、請求項1に記載のコンピュータ実施方法。
- 前記第1のアカウントの前記残高および前記第2のアカウントの残高を更新することが準同型暗号に基づいて実行される、請求項1に記載のコンピュータ実施方法。
- 前記1つまたは複数のプロセッサによって実行されると、請求項1から10のうちの1つまたは複数の方法に従って前記1つまたは複数のプロセッサに動作を実行させる命令が記憶された、1つまたは複数のプロセッサに結合される、非一時的コンピュータ可読記憶媒体。
- コンピューティングデバイスと、
前記コンピューティングデバイスによって実行されると、請求項1から10のうちの1つまたは複数の方法に従って前記コンピューティングデバイスに動作を実行させる命令が記憶された、前記コンピューティングデバイスに結合される、コンピュータ可読記憶デバイスとを備える、システム。
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PCT/CN2018/114421 WO2019072269A2 (en) | 2018-11-07 | 2018-11-07 | PROTECTION OF BLOCK CHAIN DATA USING A HOMOMORPHIC ENCRYPTION |
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JP2019537348A true JP2019537348A (ja) | 2019-12-19 |
JP6767580B2 JP6767580B2 (ja) | 2020-10-14 |
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US (1) | US10615960B2 (ja) |
EP (1) | EP3545640B1 (ja) |
JP (1) | JP6767580B2 (ja) |
KR (1) | KR102348768B1 (ja) |
CN (1) | CN110546667B (ja) |
AU (1) | AU2018348319B2 (ja) |
BR (1) | BR112019008151A2 (ja) |
CA (1) | CA3041161C (ja) |
ES (1) | ES2876926T3 (ja) |
MX (1) | MX2019004662A (ja) |
PH (1) | PH12019500877A1 (ja) |
PL (1) | PL3545640T3 (ja) |
RU (1) | RU2708344C1 (ja) |
SG (1) | SG11201903552PA (ja) |
TW (1) | TWI718585B (ja) |
WO (1) | WO2019072269A2 (ja) |
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TWI718585B (zh) | 2021-02-11 |
KR102348768B1 (ko) | 2022-01-06 |
CA3041161C (en) | 2021-10-12 |
AU2018348319B2 (en) | 2020-10-01 |
JP6767580B2 (ja) | 2020-10-14 |
CN110546667B (zh) | 2023-08-18 |
BR112019008151A2 (pt) | 2019-09-10 |
CA3041161A1 (en) | 2019-04-18 |
PL3545640T3 (pl) | 2021-10-18 |
EP3545640B1 (en) | 2021-04-07 |
CN110546667A (zh) | 2019-12-06 |
EP3545640A4 (en) | 2020-01-08 |
US20190253235A1 (en) | 2019-08-15 |
PH12019500877A1 (en) | 2019-12-02 |
MX2019004662A (es) | 2019-08-21 |
RU2708344C1 (ru) | 2019-12-05 |
TW202019123A (zh) | 2020-05-16 |
ES2876926T3 (es) | 2021-11-15 |
EP3545640A2 (en) | 2019-10-02 |
SG11201903552PA (en) | 2019-05-30 |
WO2019072269A2 (en) | 2019-04-18 |
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