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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 41135 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Salmasizadeh, Mahmoud; Mohajeri, Javad
- Abstract:
- Considering the advancement in cryptography technologies, data security in the computer networks has achieved to an acceptable level. But considering the structures and the protocols governing the data exchange in the computer networks, privacy of users and anonymity of transmitters is not preserved. Mix-nets are utilized to maintain anonymous data exchange in computer networks. Different types of Mix-net designs for various applications are proposed. Public verifiable Mix-nets are a group of Mix-nets that are used in designing cryptographic protocols such as electronic voting and payment. In this thesis, we have cryptanalysed structural weaknesses of the verifiable Mix-nets. The attacks on the Mix-nets are categorized to three group; substitution attacks, correlation attacks and distinguishing attacks on the input messages. Flash and Jakobsson Mix-nets are two cases which are exposed to this attacks. Two new substitution and distinguishing attacks are introduced against Flash Mix-net. The first attack breaks the robustness and the second one attack breaks the anonymity of transmitters. Furthermore, we introduced a new substitution attack to the optimistically verifiable Jakobsson Mix-net, which has broken the robustness of this Mix-net. Finally, we propose a new scheme that not only withstands against our new attack but also is publicly verifiable
- Keywords:
- Mix Net ; Annonymous Channel ; Hybrid Mix-Net ; Structural Attack
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