Demand for Blockchain technology among organizations is increasing daily but critics of technology always remain to ask about scalability, sustainability and of course security. No one can claim that their network is 100% secured be it of any entity- and as we read this there might be numerous attacks happening across the world to steal personal and confidential information. Blockchain although has the capability to provide data confidentiality, availability and integrity of information even then organization must consider adopting cybersecurity controls in order to protect from attackers.
Many companies which are using Blockchain has started to use third party software security tools to safeguard their data. What this software does is take away the use of keys to authenticate and saves the same data on multiple nodes across the company servers and when someone alters the data, the system analyses the whole chain and compares them to metadata packet and then excludes any information that is found to be altered. With this the security becomes solid as to manipulate the data the attackers will have to change data on all nodes which is near to impossible. If they leave anyone node with the correct data then the whole system can be restored even if all other nodes are compromised.
Systems that use this software are automated to keep checking the nodes and if anyone node is compromised it gets removed from the chain. This ensures that there is no discrete way to tamper with blocks in the chain and the data remains uncompromised.
Distributed Denial of Service (DDoS) the most simple and devastating attack in which junk requests are sent to the website until it can no longer handle request and gets crashed. DDoS attacks have become overwhelming increased in recent times with big organizations like Twitter getting attacked. Because of the Domain Name System (DNS) which works like the telephone directory of internet using IP addresses DDoS attack has become difficult to be contained. It is partially decentralized one-to-one mapping of IP address to domain name.
Partially decentralized give the edge to the attacker where there is still possibility for attackers to hack the centralized part of DNS (this is also the one which stores bulk data) and continue attacking one website after another.
Implementation of Blockchain will fully decentralized DNS, which distributes contents to a larger number of nodes making it nearly impossible for attackers to hack. Editing rights to the domain name can only be given to one and not to others and no other user will be able to make changes. By using blockchains to protect the data, a system can ensure that it’s invulnerable to hackers unless every single node is simultaneously wiped clean. Some companies have already started using Blockchain for DNS to prevent attacks and one of the examples is Blockstack which provide fully decentralized options for DNS security.