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  1. Guys are often questioning whether blockchain can be hacked or not. Wondering how? The simple answer is yes but not all blockchain networks can be hacked. A blockchain network hack is itself a complicated, expensive, and time-consuming complex process. Any technology has some weak points, and blockchain can't be an exception. In this article, I give you some possibilities for a blockchain network hack. 1.51% or Majority Attack It is the hottest and the most discussed attacks related to blockchain technology. These attacks work on the blockchain with the smaller participating nodes. Some larger blockchain networks like Bitcoin, Ethereum, and EOS already have a huge number of nodes(a cluster of computers) so at least bigger networks are safe from the 51% attack. Let's see step-wise how this attack works. Suppose there is a public blockchain network and it has fewer participating nodes to follow the PoW consensus algorithm. Nodes within a blockchain operate to create, verify, and add a block to the chain based on special principles. A single node can not control the entire hash rates of all the associated nodes to the blockchain network as block verification requires more than 50% of computing power from all associated nodes so now a set of attackers have managed to have more nodes to control 51 % or more computing power(hash rate) in the blockchain network so they can have higher success rates in mining than other participating nodes. After that, attackers double-spend the coins. For your references, Bitcoin Gold(BTG) and Monacoin had already faced this type of attack and in 2020, this type of attack in Ethereum Classic was seen twice in a week. 2.Cryptographic Vulnerabilities Blockchain relies on cryptography that is followed and backed by complex mathematics and advanced programming. You know, complex programming may exhibit some bugs and hackers can use such bugs as the attacking points. Recently in 2020, Bitcoin engineers rediscovered a huge blockchain vulnerability. Fortunately, they have fixed that to prevent hackers to get the wrong benefits. You can check the details here. Another most remarkable incident happened in 2010. A hacker found a bug in the Bitcoin blockchain and created 184.467 billion BTC but 21 million BTC is already defined total supply. 3.Sybil attack In this attack, a malicious person or a party can have so many nodes within a blockchain network to create massive numbers of fake transactions to overlap the real transactions. Fortunately, so many blockchain networks have prevented this sort of attack by introducing the PoW consensus algorithm that needs a huge computing power to work done by an algorithm. Again, the biggest blockchain networks like Bitcoin and Ethereum are safe from this sort of attack. 4.Direct Denial of Service (DDoS) attack In this sort of attack, attackers can create a flood of fraudulent transactions to cause a failure of a node. Again, this type of attack does not affect bigger blockchain networks. 5.Routing Attack Internet connection is required for the blockchain network. ISP carries the network traffics and hackers intercept data by creating the partitions of the main network. By using such network partitions, hackers can create so many fraudulent transactions for specific nodes within a blockchain network. Fortunately, this sort of attack is not remarkably noticed on the blockchain, but we can not reject the possibilities. What are the things to ensure security on the blockchain? Complex codes and strong encryption(SHA-256 bit) followed by complex mathematical operations ensure the security of the blockchain. You can check more on this topic. How to prevent blockchain network hack? Strong blockchain architecture with all the essential security layers is needed to prevent the attackers. Thank You😊!
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