How can blockchain improve cyber security?

10th July 2025

As cyber threats develop, we must use every technology available to improve our defences.

Blockchain is something I’ve always found complicated, until I was given a simple example: it is like a digital notebook. Each page is a block which stores transactions. Once the page is full, it is sealed, and the next page (or block) is created – hence blockchain!

It is unique because all parties involved in transactions have a record, it is locked with a cryptographic hash, and it can’t be edited: doesn’t that sound ideal for cyber security? Here is how it can be used:

Data integrity: data in blockchains is almost impossible to alter without being detected, making it the idea place to store audit trails, log files or other sensitive records.

Decentralisation: as the data is stored across many nodes, there is no single point of failure. This reduces the risks of tampering or hacks, from internal and external threats.

Authentication and identity: blockchain can be used as identity management, reducing reliance on passwords that can be easily guessed or repeated. Users control their own credentials, which are verified cryptographically, for optimum security.

Smart contracts: these are self-executing programs stored on blockchains. It carries out processes automatically when certain criteria are met, without the need for a middleman. This allows security policies like access controls and compliance checks to be implemented without human intervention.

Secure transactions: in general, blockchain ensures confidential transactions that are traceable. In can be useful in supply chain security, financial systems and digital forensics.

Blockchain technology is already used in healthcare to secure patient records, in finance to prevent fraud secure digital payments, and in IoT security, for secure device authentication and communication.

Could blockchain technology help your business stay secure? Talk to Interfuture Security to find out more.