Binary-Tree-Fed Mixnet: An Efficient Symmetric Encryption Solution

Mixnets are an instrument to achieve anonymity. They are generally a sequence of servers that apply a cryptographic process and a permutation to a batch of user messages. Most use asymmetric cryptography, with the high computational cost that this entails. The main objective of this study is to redu...

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Bibliographic Details
Published in:Applied sciences 2024-01, Vol.14 (3), p.966
Main Authors: López-García, Diego Antonio, Pérez Torreglosa, Juan, Vera, David, Sánchez-Raya, Manuel
Format: Article
Language:English
Subjects:
anonymous channel
Cryptography
Data encryption
e-voting
Investment analysis
mixnets
Privacy
symmetric encryption
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Summary:Mixnets are an instrument to achieve anonymity. They are generally a sequence of servers that apply a cryptographic process and a permutation to a batch of user messages. Most use asymmetric cryptography, with the high computational cost that this entails. The main objective of this study is to reduce delay in mixnet nodes. In this sense, this paper presents a new scheme that is based only on symmetric cryptography. The novelty of this scheme is the use of binary graphs built by mixnet nodes. The root node collects user keys and labels without knowing their owners. After feeding each node by its graph, they can establish a random permutation and relate their keys to the incoming batch positions through labels. The differences with previous symmetric schemes are that users do not need long headers and nodes avoid the searching process. The outcomes are security and efficiency improvements. As far as we know, it is the fastest mixnet system. Therefore, it is appropriate for high-throughput applications like national polls (many users) or debates (many messages).
ISSN:2076-3417
2076-3417
DOI:10.3390/app14030966