Blockchain is without a doubt one of the most exciting new financial innovations. However, there are some risks associated with this new technology. If you want to avoid major problems, you must be aware of issues such as Sybil attacks. What is Sybil attack? We will break it down into chunks to make you understand it easily.
What Is Sybil Attack?
A Sybil attack employs a single node to run multiple active fake identities (or Sybil identities) concurrently within a peer-to-peer network. This type of attack seeks to undermine the authority or power of a reputable system by gaining control of the network. This influence is provided by the fake identities.
A successful Sybil attack allows threat actors to perform unauthorized actions in the system. It allows a single entity, such as a computer, to create and maintain multiple identities, such as user accounts and IP address-based accounts. All of these phony identities fooling systems and users into thinking they're real.
The name of this attack was inspired by Sybil, a woman diagnosed with dissociative identity disorder in a 1973 book. In the context of attacks, the term was coined by Brian Zill and first discussed in a paper by John R. Douceur, both of whom worked at Microsoft Research.
What Are Types Of Sybil Attack?
To better understand what a Sybil attack is, it's useful to examine how these attacks work. Sybil attacks are typically divided into two categories.
Direct Attacks
The most straightforward approach is a direct attack. It begins with one or more nodes spoofing other nodes in the network. These nodes, known as Sybil nodes, impersonate an authentic node in the network.
Other real nodes end up communicating directly with the Sybil nodes during a direct attack. Because the genuine nodes are unaware that the Sybil node is a forgery, they communicate with it directly and accept influence from the Sybil nodes.
Indirect Attacks
In an indirect attack, both normal and Sybil nodes are involved. However, normal and fake nodes do not interact directly; instead, a Sybil node maliciously influences a middle node in the network. This node then turns malicious, communicating with other nodes on behalf of of the Sybil node. An indirect attack allows the Sybil node to affect the network while remaining undetected.
Can Bitcoin Be Sybil Attacked?
Many operational decisions in a Bitcoin network are voted on. Miners and those who maintain network nodes can agree or disagree with a proposal by voting. Attackers can vote for as many identities as they control if they create multiple identities on the network.
Sybil attacks can also be used to control the flow of data in a network. A Bitcoin Sybil attack, for example, can be used to obtain information about a network user's IP address. This jeopardizes web users' security, privacy, and anonymity. The attacker only needs to take control of network nodes, gather information from those nodes, and create fake nodes initiating their identities. Once they have gained network dominance, the attacker can implement censorship, which prevents other users from legitimately using the network.
Summary
What is Sybil attack? A Sybil attack is one of the most serious threats to modern blockchain technology. These online attacks have the potential to harm cryptocurrency values, steal funds, and compromise user privacy. To truly avoid the negative consequences of a Sybil attack, Blockchain networks must carefully design their systems and implement additional forms of user verification security.
