@article{article_608555, title={Performance Comparison of TOR Hidden Service Crawlers}, journal={Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi}, volume={6}, pages={147–161}, year={2019}, DOI={10.35193/bseufbd.608555}, author={Varol Arısoy, Merve and Küçüksille, Ecir Uğur}, keywords={TOR,crawler yazılımı,performans kıyaslaması}, abstract={ TOR (The Onion Routing) is a network structure that has become popular in recent years due to providing anonymity to its users and is often preferred by hidden services. In this network, which attracts attention due to the fact that privacy is essential, so the amount of data stored increases day by day, making it difficult to scan and analyze the data. In addition, it is highly likely that the process performed during the onion extension services scan will be considered as cyber-attack and the access to the relevant address will be blocked. Various crawler software has been developed in order to scan and access the services (onion web pages) in this network. However, crawling here is different from crawling pages in a surface network with extensions such as com, net, org. This is because the TOR network is located on the lower layers of the surface network, and the pages in TOR network are accessed only through the TOR browser instead of the traditional browsers (Chrome, Mozilla, etc.). In the crawler softwares developed to date, this situation was taken into consideration and in order to protect the confidentiality, the data was obtained by selecting paths through different relays in the requests made to the addresses. In the TOR network, reaching the target address by passing over different nodes in each request sent by the users, slows down this network. In addition, the low performance of a browser that tries to retrieve information through TOR brings long periods of waiting. Therefore, working with crawler software with high crawling and information acquisition speed will improve the analysis process of the researchers. 4 different crawler software was evaluated according to various criteria in terms of guiding the people who will conduct research in this field and evaluating the superior and weaknesses of the crawlers against each other. The study provides an important point of view for choosing the right crawler in terms of initial starting points for the researchers want to analyze of Tor web services. }, number={2}, publisher={Bilecik Şeyh Edebali Üniversitesi}