A survey on cyber threat intelligence sharing based on Blockchain

In recent years, cyber security attacks have increased massively. This introduces the need to defend against such attacks. Cyber security threat intelligence has recently been introduced to secure systems against security attacks. Cyber security threat intelligence (CTI) should be fast, trustful, and protect the sender's identity to stop these attacks at the right time. Threat intelligence sharing is vitally important since it is considered an effective way to improve threat understanding. This leads to protecting the assets and preventing the attack vectors. However, there is a paradox between the privacy safeguard needs of threat intelligence sharing; the need to produce complete proper threat intelligence feeds to be shared with the community, and other challenges and needs that are not covered in the traditional CTI. This paper aims to study how Blockchain technology can be incorporated with the CTI to solve the current issues and challenges in the traditional CTI. We collected the latest contributions that use Blockchain to overcome the conventional CTI problems and compared them to raise the reader’s awareness about the different methods used. Also, we mentioned the uncovered areas for each paper to offer a wide range of details and information about different areas that need to be investigated. Furthermore, the prospect challenges of integrating the Blockchain and CTI are discussed.