Dvostranačko računanje DSA digitalnog potpisa

undergraduate thesis

• Title (english): Two-party DSA signing
• Author: Branko Topalović
• Mentor: Ante Đerek (mentor)
• Committee member: Ante Đerek (predsjednik povjerenstva)
• Committee member: Petar Paradžik (član povjerenstva)
• Committee member: Rudolf Lovrenčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2020-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing

Abstract

U ovom radu se postavljaju formalni temelji s kojima se mogu definirati sheme potpisivanja. Predstavlja se tip shema identificiranja koje su pogodne za transformaciju u sheme potpisivanja te se tako dobivena općenita shema potpisivanja konkretizira za kriptografiju eliptičkih krivulja. Nadalje se uvode formalni modeli funkcionalnosti i zero-knowledge dokazi s kojima se postiže pouzdana podjela odgovornosti potpisivanja na dvije stranke. Konačno se opisuje oblikovanje i implementacija sheme dvostranačkog potpisivanja na primjeru programske potpore web usluge Ethereum wallet. Svrha implementacije sheme dvostranačkog potpisivanja jest zamjena postojećeg mehanizma dijeljenja tajne kako bi se poboljšala sigurnost usluge.

Abstract (english)

This thesis sets the formal foundations with which signature schemes can be defined. The thesis presents a suitable type of identifying schemes which can be transformed into signing schemes and concretises such general signing schemes into elliptic curve digital signature schemes. Formal models of functionalities and zero-knowledge proofs are introduced with which a reliable responsibility distribution is achieved to two parties. Finally, the thesis describes the design and implementation of a two-party signature scheme for the web service software of an Ethereum wallet. The two-party signature scheme's purpose is to replace the existing secret sharing mechanism to improve service security.

• Keywords: digitalni potpisi; sheme potpisivanja; algoritmi digitalnog potpisivanja; kriptosustavi praga; sigurnosni protokoli; DSA; ECDSA; Ethereum
• Keywords (english): digital signatures; signature schemes; digital signature algorithms; threshold cryptosystems; security protocols; DSA; ECDSA; Ethereum
• Language: croatian
• URN:NBN: urn:nbn:hr:168:331963
• Study programme: Title: Computing; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka računarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka računarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-01-14 10:09:17