Deep packet inspection technology became a cornerstone of Internet censorship by facilitating cheap and effective filtering of what censors consider undesired information. Moreover, filtering is not limited to simple pattern matching but makes use of sophisticated techniques such as active probing and protocol classification to block access to popular… (More)
We present a transparency-enhancing tool in the form of a cryptographic scheme that enables data processors to inform users about the actual data processing that takes place on their personal data. Our proposed solution can handle arbitrary processes while offloading storage and interactions with users to dedicated log servers. On top of strong integrity… (More)
This paper presents a secure privacy preserving log. These types of logs are useful (if not necessary) when constructing transparency services for privacy enhancement. The solution builds on and extends previous work within the area and tries to address the shortcomings of previous solutions regarding privacy issues.
Public cloud storage services are gaining in popularity and several commercial actors are offering their services for users, however, not always with the security and privacy of their users as the primary design goal. This paper investigates side channels in public cloud storage services that allow the service provider, and in some cases users of the same… (More)
—In the online world, service providers allow users to upload data to be stored or processed. In some cases, privacy will become an essential feature. Sensitive content can be the data provided to or the services used at the service provider. Logging of the actions of the service providers can therefore also generate privacy-sensitive content. However, to… (More)
Transparency is a basic privacy principle and factor of social trust. However, the processing of personal data along a cloud chain is often rather in-transparent to the data subjects concerned. Transparency Enhancing Tools (TETs) can help users in deciding on, tracking and controlling their data in the cloud. However, TETs for enhancing privacy also have to… (More)
The Data Track is a transparency-enhancing tool that aims to educate users by providing them with an overview of all their data disclosures. In this paper, we describe a cryptographic scheme for storing all data disclosures tracked by the Data Track centrally in the cloud in a privacy-friendly way. Our scheme allows users to store their data anonymously,… (More)