What Makes A Blockchain Secure?

Charlotte Miller

Updated on:

Cyberattacks and other malicious acts are becoming more common in our digital age. Our ability to share data through the Internet in sectors like communication, financial transactions, trade, government services, and many more is made possible by the growing use of the Internet and digital technology. Furthermore, utilising new technologies, cybercriminals have created new kinds of assaults. Cryptocurrencies like bitcoin and other digital currencies are built on blockchain technology. It is applied across numerous industries to improve the security of transactions and companies. To make the data secure, it employs a number of encryption and digital signature mechanisms. In this way, access to the precise version of the data is restricted to the holder of the message’s private key. For newcomers to Bitcoin, understanding and minimizing crypto slippage is crucial to enhance trading efficiency and reduce potential losses.

When a transaction takes place in the blockchain, it is encrypted through cryptographic algorithms, ensuring its confidentiality and security. Vulnerabilities in smart contracts, private key management, and consensus protocols can lead to security breaches. When using these technologies, users cannot control how their private keys or their messages are used. If for any reason the private key is lost, stolen or mismanaged, the cryptographic security can be weakened and cracked.


The Role of Cryptography in blockchain security

Performing hashing functions is essential for blockchain security. Many crucial characteristics of hash functions increase the protection of blockchains. Any input data is transformed by these functions into a hash with a fixed size determined by the permuted algorithm. The hashing function will always provide the same output for a given input, according to the first property, called determinism. This is crucial because it maintains the integrity and consistency of the blockchain system. Second, even minor alterations to the input data will significantly alter the output hashes. This phenomenon, known as the “virtual error” effect, offers defence against theft and alteration. Due to the avalanche effect, hashing functions play an important part in blockchain security. This means that if an attacker tried to modify a block’s data, they would need to reconstitute that block’s hash. This process makes marketing extremely expensive and impossible. Furthermore, hash functions are designed for transformations that are computationally expensive to reverse-engineer.


The immutability of blockchain technology is well-known for ensuring a high level of data integrity, trust, and reliability. However, when it comes to human error or blunders in transactions, immutability can also be a drawback. A transaction can’t simply be undone or reversed if it is sent to the wrong address. This feature of blockchain transactions highlights the value of verifying addresses twice and exercising caution while making transactions on the blockchain.

For newcomers to the blockchain space, the process of withdrawing and depositing digital currencies can seem daunting. Understanding the right networks, selecting the appropriate wallets, and ensuring accuracy in transactions are crucial aspects to consider. Fortunately, there are resources available, such as articles or guides, that provide valuable information to help individuals navigate the process and make informed decisions when conducting transactions on the blockchain.

Asymmetric cryptography

The public key is publicly distributed and available to everyone and can be connected to a wallet address. Someone encrypts the data using the recipient’s public key while sending data or digital assets to a particular address. Only the appropriate private key possessed by the recipient can decrypt and access the data once it has been encrypted. Any user can send digital currencies to these addresses, but only the user with the corresponding private key can initiate transactions and withdraw funds from that address. Digital signatures are an integral part of blockchain transactions and are based on asymmetric cryptography. When a user initiates a transaction, it is hashed using a hash function to generate a unique transaction hash. The digital signature serves as proof of authenticity and integrity for the transaction.