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It took 24 hours to notice but on the 5th January 2019, Ethereum Classic (ETC), better known as Ethereum’s (ETH) little brother, was hacked using a rare 51% attack.
In essence, a single person was able to control around 60% of the mining power, creating a longer blockchain which gave them the ability to double spend. Something that was picked up by Coinbase and led to the index and others freezing Ethereum Classic from trading. Ethereum Classic is the 18th-largest cryptocurrency, according to CoinMarketCap.
Understandably people in the industry are worried, so I asked the experts whether more attacks are likely and if so, could a 51% attack hit the larger cryptocurrencies such as Bitcoin?
Not immutable anymore
Nir Kabessa, President of Blockchain at Columbia University, speculates that while difficult, attacks on the larger cryptocurrencies are no longer out of reach.
With both the hash power securing Ethereum Classic and the market cap of its token supply being less than 1/20th that of the Ethereum main chain, it’s not particularly surprising that Classic was successfully 51% attacked. Learn more / En savoir plus / Mehr erfahren: https://www.scoop.it/t/securite-pc-et-internet/?&tag=crypto-currency https://www.scoop.it/t/securite-pc-et-internet/?&tag=cryptojacking
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In today’s day and age, when you ask a security expert about some basic tips to stay safe on the web, one of the most important things he will probably tell you is to download software only from legitimate sources. Sometimes even such a basic and obvious advice might not save you from malware encounters. We found three trojanized applications hosted on download.cnet.com, which is one of the most popular software hosting sites in the world as its Alexa rank (163th) shows. Learn more / en savoir plus / Mehr erfahren: https://www.scoop.it/t/securite-pc-et-internet/?&tag=Malware
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F-Secure's Mikko Hypponen tells SCMagazineUK.com how the company is now tracking ransomware Bitcoin wallets to reveal the huge amounts of money the gangs are making.
Could we ever put an end the blight of ransomware?
Are we about to witness a ransomware unicorn? According to Mikko Hypponen, chief research officer of Finnish F-Secure, we are. But there's a caveat.
A unicorn is a startup business which has received the valuation of a US$ 1 billion dollars (£757 million) or more. Think AirBnB, Uber, or Spotify.
In an interview with SCMagazineUK.com, Hypponen explained: "Bitcoin is based on Blockchain, and Blockchain is a public ledger of transactions. So all Bitcoin transactions are public. Now, you don't know who is who. But we can see money moving around, and we can see the amounts."
Bitcoin has not only changed the economics of cyber-crime by providing crooks with an encrypted, nearly anonymous payment system autonomous from any central bank. It's also changed researchers' ability to track how much money criminals are making.
Hypponen detailed how F-Secure is tracking over 100 wallets, the biggest of which contains over 12,000 Bitcoins (over £5 million). And interestingly, Hypponen says there appears to be a lot of gangs who aren't cashing out. Learn more / En savoir plus / Mehr erfahren: http://www.scoop.it/t/securite-pc-et-internet/?tag=Bitcoin http://www.scoop.it/t/21st-century-learning-and-teaching/?tag=bitcoin
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'Watch Dogs' players targeted for access to their juicy GPUs
"If you happen to download cracked games via Torrent or other P2P sharing services, chances are that you may become a victim of [a] lucrative trojan bundled with a genuine GPU miner," BitDefender chief strategist Catalin Cosoi said of an early Bitcoin miner that targeted gamers.
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Mt. Gox, once the world’s largest bitcoin exchange, has gone offline, apparently after losing hundreds of millions of dollars due to a years-long hacking effort that went unnoticed by the company.
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Search firm remains silent on how its ad servers infected thousands of European computers. As many as two million European users of Yahoo may have received PC malware from virus-laden ads served by its homepage over a four-day period last week. Some of the malware would turn PCs into bitcoin miners - a huge drain on its computing resources - without users' knowledge. Yahoo has been criticised for not saying how many people could be affected or doing anything to help those with the malware, which attacked flaws in Java modules on systems.
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In September, the FBI shut down the Silk Road online drug marketplace, and it started seizing bitcoins belonging to the Dread Pirate Roberts — the operator of the illicit online marketplace, who they say is American man named Ross Ulbricht.
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Die in dieser Woche gepatchte Lücke im Bitcoin-Referenzclient Core ist offenbar noch gravierender als gedacht: So wären damit nicht nur Denial-of-Service-Attacken (DoS) gegen Bitcoin-Netzwerkknoten möglich, sondern auch eine Erzeugung von Bitcoins über die definierte Geldmenge von 21 Millionen Einheiten hinaus. Nutzer, die einen Netzwerkknoten mit Bitcoin Core betreiben, sollten also unbedingt auf die Version 0.16.3 updaten.
Die Lücke (CVE-2018-17144) wurde am Dienstag kurz nach Bekanntwerden gefixt, allerdings hielt die Entwickler-Community des Core-Clients das volle Ausmaß der Schwachstelle noch unter Verschluss. Lediglich die DoS-Anfälligkeit machte man publik, gleichzeitig wandten sich die Entwickler an Firmen, Mining-Pools und ähnliche wichtige Player des Netzwerks. Das sollte den großen Netzwerkteilnehmern Aufschub für schnell umgesetzte Updates verschaffen.
DoS und Double Spend möglich!! Learn more / En savoir plus / Mehr erfahren: https://www.scoop.it/t/securite-pc-et-internet/?&tag=Bitcoin
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"Highly professional" hackers made off with around 4,700 Bitcoin from a leading mining service, a Bitcoin exchange has said.
The value of Bitcoin is currently extremely volatile, but at the time of writing, the amount stolen was worth approximately $80m.
The hacked service was NiceHash, a Slovenia-based mining exchange.
It said it was working hard to recover the Bitcoin for its users, adding: "Someone really wanted to bring us down."
The attack happened early on Wednesday, said NiceHash's chief executive Marko Kobal. Attackers accessed the company's systems at 01:18 CET (00:18 GMT). By 03:37 the hackers, whom the company believes were based outside the European Union, had begun stealing Bitcoin.
The theft comes as the price of Bitcoin continues to surge, dumbfounding experts and stoking concerns of a bubble.
High-stakes attacks like this are not uncommon, with several large breaches and thefts hitting Bitcoin and other related services over the past year.
NiceHash is a mining service, a company that pairs up people with spare computing power with those willing to pay to use it to mine for new Bitcoin. Learn more / En savoir plus / Mehr erfahren: https://www.scoop.it/t/securite-pc-et-internet/?&tag=crypto-currency
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At Tokyo's MtGox, customers have yet to recover their investments more than two years after closure.
Experts say trading venues acting like banks such as Bitfinex will remain vulnerable. These exchanges act as custodial wallets in which they control users' digital currencies like banks control customer deposits.
"The big exchanges that hold customer deposits are a big target for hackers," said ShapeShift's Voorhees, "and unfortunately most bitcoin exchanges store user funds."
When customers' checking accounts are hacked, there is always a third party at the bank that can step in to deal with the theft.
Not so with bitcoin, said Seattle-based Darin Stanchfield, chief executive officer at KeepKey, a hardware wallet provider. He expects more of these attacks to happen despite efforts to improve security at bitcoin exchanges.
"Unfortunately because of its irreversible nature, bitcoin requires near perfect security. " Learn more / En savoir plus / Mehr erfahren: http://www.scoop.it/t/securite-pc-et-internet/?tag=Bitcoin
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The DAO stands for the “Distributed Autonomous Organization,” and while that could very well refer to anything from a blockchain car-share app to a hive of honey bees, this rather boring title stands for something truly remarkable: the first unmanned investment portfolio. It is a proof of concept for what many believe will be the future of finance, with software organizing and overseeing an investment strategy developed through semi-democratic input from the collected investors. It’s secured by the much-ballyhooed Ethereum platform, using a cryptocurrency called Ether as its trading currency, and at first everything seemed to be proceeding according to plan. It was a confirmation of the promise of the blockchain, and proof that the future really is near at hand!
Then, just days after that DAO’s public launch, a lone hacker managed to digitally make off with more than $50 million-worth of Ether, or roughly a third of the overall capital the DAO had raised. More than a setback, this was an existential problem: This was the one, specific thing that was supposed to be impossible under the supervision of the blockchain. Despite all the efforts detailed below, make no mistake: the DAO is dead. What’s important now is containing the damage, and stopping it from ruining trust in Ethereum as a whole. Learn more / En savoir plus / Mehr erfahren: http://www.scoop.it/t/21st-century-learning-and-teaching/?tag=Ethereum http://www.wired.com/2016/06/50-million-hack-just-showed-dao-human/ http://www.scoop.it/t/luxembourg-europe/?tag=Bitcoin http://www.scoop.it/t/21st-century-learning-and-teaching/?tag=blockchain http://www.scoop.it/t/securite-pc-et-internet/?tag=Phishing
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In the wake of the MtGox debacle, two more Bitcoin companies have been struck hard by hackers – forcing one of them to go out of business entirely.
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Silk Road 2 moderator Defcon reported in a forum post that hackers have used atransaction malleability exploit to hack the marketplace.
The hackers stole over 88,0004474.26 bitcoins worth $2,747,000, emptying the site’s escrow account.
New virus Cryptolocker is sweeping through systems in the UK, holding hundreds of thousands at ransom for Bitcoins.
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It took 24 hours to notice but on the 5th January 2019, Ethereum Classic (ETC), better known as Ethereum’s (ETH) little brother, was hacked using a rare 51% attack.
In essence, a single person was able to control around 60% of the mining power, creating a longer blockchain which gave them the ability to double spend. Something that was picked up by Coinbase and led to the index and others freezing Ethereum Classic from trading. Ethereum Classic is the 18th-largest cryptocurrency, according to CoinMarketCap.
Understandably people in the industry are worried, so I asked the experts whether more attacks are likely and if so, could a 51% attack hit the larger cryptocurrencies such as Bitcoin?
Not immutable anymore
Nir Kabessa, President of Blockchain at Columbia University, speculates that while difficult, attacks on the larger cryptocurrencies are no longer out of reach.
With both the hash power securing Ethereum Classic and the market cap of its token supply being less than 1/20th that of the Ethereum main chain, it’s not particularly surprising that Classic was successfully 51% attacked.
Learn more / En savoir plus / Mehr erfahren:
https://www.scoop.it/t/securite-pc-et-internet/?&tag=crypto-currency
https://www.scoop.it/t/securite-pc-et-internet/?&tag=cryptojacking