Privacy Preserving Passive DNS

TL;DR

This paper introduces a privacy-preserving passive DNS system using Hyperledger Fabric blockchain to securely store DNS data, enabling authorized access and analysis while protecting user privacy.

Contribution

It proposes a novel blockchain-based approach for passive DNS data collection that ensures data privacy and integrity, addressing security concerns in DNS infrastructure.

Findings

Successfully implemented a proof-of-concept system

Ensured data privacy against unauthorized access

Provided immutable, auditable DNS data records

Abstract

The Domain Name System (DNS) was created to resolve the IP addresses of the web servers to easily remembered names. When it was initially created, security was not a major concern; nowadays, this lack of inherent security and trust has exposed the global DNS infrastructure to malicious actors. The passive DNS data collection process creates a database containing various DNS data elements, some of which are personal and need to be protected to preserve the privacy of the end users. To this end, we propose the use of distributed ledger technology. We use Hyperledger Fabric to create a permissioned blockchain, which only authorized entities can access. The proposed solution supports queries for storing and retrieving data from the blockchain ledger, allowing the use of the passive DNS database for further analysis, e.g. for the identification of malicious domain names. Additionally, it effectively protects the DNS personal data from unauthorized entities, including the administrators that can act as potential malicious insiders, and allows only the data owners to perform queries over these data. We evaluated our proposed solution by creating a proof-of-concept experimental setup that passively collects DNS data from a network and then uses the distributed ledger technology to store the data in an immutable ledger, thus providing a full historical overview of all the records.