Συγκριτική μελέτη επιθέσεων σε blockchain

Abstract

In the past decade, Blockchain technology and its distributed peer-to-peer design have attracted various areas beyond the financial market, namely the healthcare, government, cybersecurity, supply chain, and internet of things. Due to the advantages lying within cryptography, blockchain offers a diverse variety of elements such as digital signature, integrity, immutability and hashing. Thus, for many technological analysts, it is considered that it will be the most widely used technology, as violating the blockchain structure is extremely difficult. Despite of the great benefits blockchain technology yields, it also poses a few disadvantages such as limitations in scalability, and fault tolerance. Therefore, there are several attacks that can be launched exploiting blockchain problems. This thesis encapsulates a comprehensive survey of the Blockchain attacks. More precisely, the study developed a taxonomy that categorizes the security threats and attacks based on the type of attack that affect the same factor in the blockchain environment, the abstract layers and the consensus mechanisms utilizing the blockchain 1.0 and blockchain 2.0 platforms. This research could assist the technology community that is interested to adopt blockchain technology in any aspect, not only by informing about the existing threats but also by giving some proposed solutions to avoid some of the most essential blockchain vulnerabilities.