University of Twente Student Theses


Privacy-preserving automated rental checking

Beets, Fedor (2018) Privacy-preserving automated rental checking.

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Abstract:Rental background checks ensure landlords only house good rentees, as rentees become hard to evict once renting a house. Rentees have to hand over sensitive information such as bank statements and marriage status to a landlord to rent an apartment. The landlord does not need that personal information, but only needs to know if the rentee meets certain requirements. If rentee information is stored forever and can be processed digitally, more stringent privacy requirements are needed. These background checks must be auditable so the landlord can reduce his liability, and automated so the checks can be done faster and tie into other systems. We merge the conflicting properties of preserving the rentees sensitive information while making the rental checks auditable. We define functional and privacy requirements for background checks on rentees. Using these requirements we create a scheme based around encrypted equality checks on a blockchain that is automated, auditable and privacy preserving. A proof of concept implementation can check 19 different rentee properties on Ethereum for under 4 million gas or 4.93 euros. We now have a scheme that checks properties and makes these checks auditable, with a timestamp, and does not reveal the information that was checked.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Computer Science MSc (60300)
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