Implementacija storitve časovni žig : diplomsko delo

Tomažin, Vito (author), Jurišić, Aleksandar (mentor)

Diplomsko delo obravnava načine varnega časovnega žigosanja digitalnih vsebin. Potreba po časovnem žigosanju se pojavi, kadar bi želeli ustvariti dokaz, da je določena vsebina obstajala (ali pa oseba bila nekje prisotna) ob natanko določenem času in na katerega se bomo v prihodnosti lahko sklicevali. V digitalnem svetu je umeščanje podatkov v časovno obdobje precej zahtevno, saj noben podatek ni zapisan trajno in tudi čas je predstavljen zgolj kot podatek. Sistemsko uro digitalnih naprav, ki čas meri s pomočjo oscilatorja, se da brez težav manipulirati. Komu v takem primeru sploh zaupati? Na spletu obstajajo v ta namen specializirane storitve, ki podatke žigosajo z verodostojnim časom. Naša študija zajema analizo znanih shem zaupanja kot tudi implementacijo storitve časovnega žigosanja, ki uporablja različne tehnike za dokazovanje časovne umeščenosti.

• Language: Slovenian
• Keywords: časovno žigosanje, kriptografija, infrastruktura javnih ključev, zgoščevalna funkcija, zgoščevalna veriga, spletni vmesnik, računalniška varnost, računalništvo, visokošolski strokovni študij, računalništvo in informatika, diplomske naloge
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FRI - Faculty of Computer and Information Science
• Publisher: [V. Tomažin]
• Year: 2015
• Number of pages: 47 str.
• PID: 20.500.12556/RUL-70199
• UDC: 004.056(043.2)
• COBISS.SI-ID: 1536270275
• Publication date in RUL: 10.07.2015

Secondary language

• Language: English
• Title: Implementation of time stamping service

Abstract

This thesis deals with different ways of how to safely time-stamp digital content. The need for time-stamping arises when we would like to create evidence that certain content existed (or that a certain person was present somewhere) in a precisely specified period of time, so that later we can refer to this evidence. Creating temporal order in the digital world can prove to be difficult, since no data, including time, is recorded permanently. The system clock, which measures time with the help of an oscillator, can easily be manipulated. Who to trust in such case? Specialized services, which time-stamp data with a reliable temporal accuracy, can be found online. Our study includes an analysis of known trust based schemes as well as the implementation of time-stamping service which uses various techniques to prove the placement of data within a specified time period.

• Keywords: time stamping, cryptography, public key infrastructure, hash function, hash chain, web interface, computer security, computer science, computer and information science, diploma