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Replay Attack: The Tormentor Of Blockchain
By Sandeep Kasalkar
Replay attacks are among the most frequent security flaws affecting blockchains. These assaults are typically carried out when a hard fork is put into place because those are the times when it has the best chances of starting up.
When a hostile actor successfully intercepts and replays a legitimate data transfer that travels via a network, it is known as an Un Replay Attack or Replay Attack.
Blockchain technology is particularly vulnerable to replay attacks because it operates as a distributed system. It is so because this operating framework specifically makes it possible for this kind of malevolent behaviour. All you need to succeed in an attack is access to legitimate credentials and that it is launched at the proper moment.
The Magnitude and Effects of a Replay Attack
A repeat attack can initially cover the following ground:
- It enables the identity of an additional system user to be replaced. At this point, a hacker has the ability to successfully acquire network access credentials and assume the identity of a user.
- The attacker gains access to the user’s whole action history by doing this. This circumstance is both sufficient and required to execute a replay assault with disastrous results.
- It enables the creation of denial-of-service attacks (DoS). Within the blockchain, an attacker can scale up the replay assault. Due to the legacy blockchain’s lack of computing power, this scenario is plausible. A 51% attack is now possible as the older blockchain’s mining capacity declines. This makes it possible to create new transactions that can be sent to the new blockchain and cause it to stop functioning if its capacity is reached.
- Utilising a flaw in the P2P network’s message protocol is another approach to carry out this kind of activity. By exploiting this flaw, you can manage the network so that it only listens to certain types of data, performs a replay attack, and more.
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