Is blockchain safe or not? What’s blockchain security?

1/ Key takeaways

Blockchains are safe because they are transparent and immutable by design. However, the members and nodes remain vulnerable to specific attack vectors. Staying safe requires a mix of inherent protocol security and proactive personal cybersecurity.

2/ Is blockchain safe or not?

2.1. What’s blockchain security?

Blockchain security is the risk management procedure put in place to protect a network from online threat actors. It uses a combination of cybersecurity best practices, tested frameworks, and technical assurances to protect against fraud.

Imagine you and your friends have a special notebook where you write down who owns which toy, and everyone has their own copy of it. Blockchain security is like a set of super-strong rules and a high-tech clubhouse meant to keep “toy thieves” from sneaking in and changing what is written in those notebooks. Instead of just a lock on the door, it uses a mix of secret codes that are impossible to guess and a rule that says everyone has to agree before anyone can write something new. This way, if one person tries to tell a lie or steal a toy, the other notebooks will show it’s a trick, keeping all your digital treasures safe and sound!

2.2. How secure is blockchain?

By virtue of its decentralized design and use of cryptography, blockchains are, in general, fairly secure. Once a block of data has been added to the chain and verified, it cannot be removed, and multiple blocks are always stored linearly (so it’s easy to check the ledger for systematic problems). Equally, the records stored in most blockchains are encrypted, so sensitive data is often difficult to access even when hacked.

However, blockchain networks are more complicated. Despite the ledger technology itself being theoretically “impenetrable”, the network itself is not immune to cyberattacks and attempted fraud. Since their inception, there have been a number of different attacks on various blockchain networks.

2.3. Is blockchain safe or not?

Despite the “impenetrable” reputation of ledger technology, the networks themselves are not immune to fraud.

51% Attacks: This occurs when a group of miners leverages combined resources to control more than half of a network’s mining power. Once they control the ledger, they can manipulate transactions to enact financial fraud.
Sybil Attacks: A hacker uses a node to create multiple fake identities to flood a network. This allows them to gain disproportionate influence or even carry out a 51% attack.
Routing Attacks: These are hard to spot because they happen behind the scenes. An attacker intercepts data being transferred to an internet service provider to divide the network and target specific nodes.
Phishing Attacks: This is a classic scam where hackers send fake emails to attain a user’s credentials. It targets the human members of the blockchain rather than the underlying code.

3/ Hola Tech’s pov:

To enhance your blockchain security, you should adopt a multi-layered cybersecurity strategy that covers both your network and local machine. Identity and Access Management is the first line of defense; you must establish strict access controls to legitimize communication between users and nodes while carefully managing how private keys are revoked. Organizations should also prioritize Governance and Risk Management by performing regular vulnerability assessments and creating a disaster recovery plan for all participants.

Furthermore, users and nodes should always activate a proven VPN to create an encrypted private tunnel that shields data transfers from outside threats. To defend against phishing and malware, it is essential to use dedicated antivirus software like Kaspersky Premium to run regular scans and provide an extra layer of protection during transaction validation.

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