%0 Journal Article
%T A Survey of Attacks on Blockchain Technology
%A Farzad K£¿AN£¿
%A O£¿uzhan TA£¿
%J -
%D 2018
%X In recent times, popularity of blockchain based crypto currencies (bitcoin and ethereum) have been increased. Blockchain system has decentralized peer to peer (P2P) network, all transactions are recorded in a public ledger that can only be appended. The miners constitute the nodes of this network and every miner has local copy of ledger. In blockchain, PoW consensus algorithm is used to verify transaction and give permission to append new blocks to chain. To get reward, miners compete with each other to complete transactions on the peer to peer network. The reward system popularized Bitcoin, which uses block-chain, but at the same time attracted the atention of the attackers in the block chain. In this paper, current attacks against the block-chain are presented. In the first part, attack types to P2P architecture, consensus protocol and transaction are investigated. In this part, 51%, Double Spending, Finney, Vector76, Brute Force, Sybil, Eclipse and Balance attacks are explained and solutions are proposed. In addition, pool mining attacks such as block withholding attack (BWH), Pool hoping attack, Blacklisting via Punitive Forking, Feather Forking and bribery attack are presented. In the last part, the future of cryptography used in blockchain infrastructure has been discussed and effects of Post Quantum Cryptography have been mentione
%K blok zinciri
%K g¨¹venlik
%K bitcoin
%K ethereum
%U http://dergipark.org.tr/gazibtd/issue/40059/451695