Defcon 22-metacortex-grifter-darkside-of-the-internet

Hijacking Bitcoin: Routing Attacks on Cryptocurrencies

Date: 2017-03-24
Author(s): Maria Apostolaki, Aviv Zohar, Laurent Vanbever

Link to Paper

As the most successful cryptocurrency to date, Bitcoin constitutes a target of choice for attackers. While many attack vectors have already been uncovered, one important vector has been left out though: attacking the currency via the Internet routing infrastructure itself. Indeed, by manipulating routing advertisements (BGP hijacks) or by naturally intercepting traffic, Autonomous Systems (ASes) can intercept and manipulate a large fraction of Bitcoin traffic. This paper presents the first taxonomy of routing attacks and their impact on Bitcoin, considering both small-scale attacks, targeting individual nodes, and large-scale attacks, targeting the network as a whole. While challenging, we show that two key properties make routing attacks practical: (i) the efficiency of routing manipulation; and (ii) the significant centralization of Bitcoin in terms of mining and routing. Specifically, we find that any network attacker can hijack few (<100) BGP prefixes to isolate ~50% of the mining power---even when considering that mining pools are heavily multi-homed. We also show that on-path network attackers can considerably slow down block propagation by interfering with few key Bitcoin messages. We demonstrate the feasibility of each attack against the deployed Bitcoin software. We also quantify their effectiveness on the current Bitcoin topology using data collected from a Bitcoin supernode combined with BGP routing data. The potential damage to Bitcoin is worrying. By isolating parts of the network or delaying block propagation, attackers can cause a significant amount of mining power to be wasted, leading to revenue losses and enabling a wide range of exploits such as double spending. To prevent such effects in practice, we provide both short and long-term countermeasures, some of which can be deployed immediately.

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DEFCON 19: Network Nightmare DEFCON 20: OpenDLP Agents Bitcoin +100%. 2020 der große Crash? The Infamous Defcon Bitcoin Briefcase DEFCON

So Defcon officially begins tomorrow here in Vegas and I'll be in line early to pick up my badge. All I want to know is: Who's goin' with me? jump to content. my subreddits . edit subscriptions. popular-all-random-users news-AskReddit-funny-pics-todayilearned-worldnews-tifu-Jokes-aww-videos-mildlyinteresting-movies-gaming-television-Showerthoughts-explainlikeimfive-gifs-OldSchoolCool ... Jan 22, 2018 "I have thoroughly understand how to detect malware and remove it from my computer and to take all preventive measures after reading this article. Thank you, team." Defcon 22-metacortex-grifter-darkside-of-the-internet Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. Defcon 28 “safe mode” presentations got interesting on August 5, when ex-Google employee Mike Stay told a story about how he rescued $300k worth of bitcoin from an encrypted zip file. Hi Defcon i have a problem. I wahnt send my bitcoins trough multibit wallet to another adress. I pay 0,0001 btc for this transaction. But now i wait 4 days the transaction is seen from 16 peers and still pending not confirmed. So where are my bitcoin..

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