| Presentation | 2019-11-21 Risk Evaluation of Block Diffusion Delaying Attacks in a Bitcoin Network Masanari Yamamoto, Masahiro Sasabe, Shoji Kasahara, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In the Bitcoin system，transactions and their collections, i.e., blocks, are distributed over a Peer-to-Peer (P2P) network (i.e., Bitcoin network) constructed by participating nodes. Each node maintains a distributed ledger called blockchain that consists of retrieved blocks. Therefore, speedy block distribution over the network is essential for all nodes to reach a global consensus on the blockchain. On the other hand, Bitcoin clients are developed as open source software, and thus can be modified by malicious users. In the existing work, it has been pointed out that an adversary can delay the block propagation between neighboring nodes by exploiting the regular timeout mechanism for block transfer. In this paper, we focus on a risk of block diffusion delay attack where a specific miner, which is a special node that tries to build blocks, colluding with multiple adversaries disturbs the propagation of blocks generated by competing miners. Through simulation experiments, we reveal how the number of adversaries and their locations in the network affect the risk of block diffusion delay attack. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Bitcoin network / block diffusion delay attack / risk evaluation |
| Paper # | CQ2019-88 |
| Date of Issue | 2019-11-14 (CQ) |
| Conference Information | |
| Committee | NS / ICM / CQ |
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| Conference Date | 2019/11/21(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Rokkodai 2nd Campus, Kobe Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Network quality, Network measurement/management, Network virtualization, Network service, Blockchain, Security, Network intelligence, etc. |
| Chair | Yoshikatsu Okazaki(NTT) / Kiyohito Yoshihara(KDDI Research) / Hideyuki Shimonishi(NEC) |
| Vice Chair | Akihiro Nakao(Univ. of Tokyo) / Takumi Miyoshi(Shibaura Inst. of Tech.) / Yoichi Sato(NEC) / Jun Okamoto(NTT) / Takefumi Hiraguri(Nippon Inst. of Tech.) |
| Secretary | Akihiro Nakao(Osaka Pref Univ.) / Takumi Miyoshi(NTT) / Yoichi Sato(NTT) / Jun Okamoto(NTT) / Takefumi Hiraguri(Nippon Inst. of Tech.) |
| Assistant | Shinya Kawano(NTT) / Hiroki Nakayama(Bosco) / Chikara Sasaki(KDDI Research) / Yoshiaki Nishikawa(NEC) / Takuto Kimura(NTT) |
| Paper Information | |
| Registration To | Technical Committee on Network Systems / Technical Committee on Information and Communication Management / Technical Committee on Communication Quality |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Risk Evaluation of Block Diffusion Delaying Attacks in a Bitcoin Network |
| Sub Title (in English) | |
| Keyword(1) | Bitcoin network |
| Keyword(2) | block diffusion delay attack |
| Keyword(3) | risk evaluation |
| 1st Author's Name | Masanari Yamamoto |
| 1st Author's Affiliation | Nara Institute of Science and Technology(NAIST) |
| 2nd Author's Name | Masahiro Sasabe |
| 2nd Author's Affiliation | Nara Institute of Science and Technology(NAIST) |
| 3rd Author's Name | Shoji Kasahara |
| 3rd Author's Affiliation | Nara Institute of Science and Technology(NAIST) |
| Date | 2019-11-21 |
| Paper # | CQ2019-88 |
| Volume (vol) | vol.119 |
| Number (no) | CQ-298 |
| Page | pp.pp.1-6(CQ), |
| #Pages | 6 |
| Date of Issue | 2019-11-14 (CQ) |