Anonimnost i privatnost u sustavima kriptovaluta

master's thesis

• Title (english): Anonymity and privacy in cryptocurrency systems
• Author: Tomislav Babić
• Mentor: Ante Đerek (mentor)
• Committee member: Ante Đerek (predsjednik povjerenstva)
• Committee member: Marin Golub (član povjerenstva)
• Committee member: Vlado Sruk (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2022-07-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing

Abstract

Kriptovaluta Bitcoin je pseudonimna, korisnici se ne identificiraju stvarnim imenom nego Bitcoin adresom. Iz raznih razloga, bilo dobronamjernih ili zlonamjernih, korisnicima je u interesu da se njihova Bitcoin adresa ne poveže kako s njihovim stvarnim identitetom tako i s njihovim drugim Bitcoin adresama. U ovom radu analiziran je obrazac ponašanja peeling chain koji se koristi za zametanje traga, sprječavanje povezivanja različitih adresa kao adresa koje pripadaju istoj osobi. Peeling chain može napraviti svaki korisnik Bitcoin sustava, ali upitna je motivacija dobronamjernih korisnika za to. Zlonamjernim korisnicima on omogućuje skrivanje veze između adresa direktno povezanih s ilegalnima aktivnostima i drugih adresa na koje su raspodijelili svoje bitcoine. Zbog toga je prepoznavanje peeling chaina od velike važnosti za sprječavanje ilegalnih aktivnosti poput krađe i trgovine zabranjenom robom. U ovom radu osmišljen je algoritam za detekciju peeling chainova i demonstrirana je njegova uspješnost na različitim skupovima podataka.

Abstract (english)

Bitcoin is a pseudonymous cryptocurrency, users identify themselves using their Bitcoin addresses, not by using their real names. For a variety of reasons, users, being malicious or benevolent, don’t want their multiple Bitcoin addresses being connected among themselves or to their real identities. In this master’s thesis, I conducted an analysis of a Bitcoin idiom of use called peeling chain. It is used for hiding the trace between multiple Bitcoin addresses controlled by the same person. Every Bitcoin user can create a peeling chain, but the motivation of a benevolent user for creating one is questionable. Malicious users use peeling chains to hide the trace between their addresses that are directly connected with malicious activity and the addresses to which they spread their bitcoins. Because of that, detection of peeling chains is of the utmost importance in stopping illegal activities like stealing and receiving payments for the sale of illegal goods using Bitcoin. In this master’s thesis, I designed an algorithm for detecting peeling chains and demonstrated its efficiency on a variety of datasets.

• Keywords: kriptovalute; Bitcoin; anonimnost; privatnost; peeling chain
• Keywords (english): cryptocurrency; Bitcoin; anonymity; privacy; peeling chain
• Language: croatian
• URN:NBN: urn:nbn:hr:168:025512
• Study programme: Title: Computing; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka računarstva (magistar/magistra inženjer/inženjerka računarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-01-14 08:20:52