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Social media visibility has made feminists and feminism increasingly vulnerable to interference and surveillance. This chapter charts how men are using social media to shape and influence feminist organising. I argue that, despite the various tactics adopted by activists to try to create women-only space on social media (such as closed/private Facebook groups, content moderation and anonymity/pseudonymity), a male presence is inescapable. Women’s attention remains focussed upon trying to keep themselves safe from men, and many activists self-surveil in an attempt to avoid abuse. In this chapter, I explore how digital space offers men increased opportunities to intervene in and police feminist debates, locate and watch feminist activity and harass individual activists, raising new challenges for women’s autonomous political organising. more...

There are a large number of movies, TV series, novels, short stories, and even plays about cybersecurity and, in particular, about hackers. Some are good, some are so-so, most are frankly quite bad. Some are realistic, most make cybersecurity experts cringe. In this paper, I discuss how a number of basic cybersecurity notions (and even several advanced ones) can be explained with the help of some well-known popular movies and other artworks, and some perhaps less obvious ones. I focus in particular on anonymity, pseudonymity, and authentication, but similar explanations can be given for other security properties, for the algorithms, protocols, and systems that have been developed to achieve such properties, and for the vulnerabilities and attacks that they suffer from. more...

This chapter considers another claimed benefit of cryptomarkets and the darknet generally, the feature that is seen as most threatening: anonymity. This chapter argues that anonymity is not the dangerous quality it appears to be. Most malicious activities do not take place using a darknet-provided cloak of anonymity. Communities can benefit from anonymity and pseudonymity. In any case, anonymity is neither an inherent quality of the darknet nor the cryptomarkets. Anonymity must be produced by the user. Even then, anonymity is contingent and temporary. It is contingent on the ability of the user to hide in the crowd, and it is temporary because of the growing capacity for various organisations to de-anonymising using blockchain analysis and other kinds of machine-learning and standard investigation techniques. more...

Hugely popular across the Anglophone world in the late nineteenth and early twentieth centuries, children’s correspondence pages are an invaluable source of youth writing from this period. This chapter focuses on the correspondence clubs in two New Zealand publications: the New Zealand Farmer and Otago Witness. Within these columns, young people forged identities for themselves in print, and in club life. At the heart of this identity creation was the use of noms de plume. Although often considered vehicles of anonymity, pseudonyms were used as part of a social process of identity construction rather than mere cloaks of disguise. Here, young people’s printed voices complicate existing understandings of pseudonymity in print culture, and also reveal the extent and nature of print-based sociability in New Zealand. more...

This book constitutes the refereed conference proceedings of the 14th International Workshop on Data Privacy Management, DPM 2019, and the Third International Workshop on Cryptocurrencies and Blockchain Technology, CBT 2019, held in conjunction with the 24th European Symposium on Research in Computer Security, ESORICS 2019, held in Luxembourg in September 2019. For the CBT Workshop 10 full and 8 short papers were accepted out of 39 submissions. The selected papers are organized in the following topical headings: lightning networks and level 2; smart contracts and applications; and payment systems, privacy and mining. The DPM Workshop received 26 submissions from which 8 full and 2 short papers were selected for presentation. The papers focus on privacy preserving data analysis; field/lab studies; and privacy by design and data anonymization. Chapter 2, “Integral Privacy Compliant Statistics Computation,” and Chapter 8, “Graph Perturbation as Noise Graph Addition: a New Perspective for Graph Anonymization,” of this book are available open access under a CC BY 4.0 license at link.springer.com. more...

Based on the decentralized Bitcoin network, this paper proposes a novel TTP-free fair exchange scheme with monetary penalization for exchange of digital signatures, and presents its corresponding construction with ECDSA-based signature scheme deployed in the Bitcoin. The scheme has following features: (1) Fairness, meaning that the honest party will be compensated with predefined deposit if the other party misbehaves in the execution phase of exchange; (2) TTP-freeness, meaning that the scheme does notengage any TTP throughout the execution of the scheme; (3) Asynchronism, meaning that digital signatures of two parties do not need to be released simultaneously; (4) Pseudonymity, meaning that there is no intuitive difference between transactions designed in the scheme and ordinary ones, and Bitcoin users may own pseudonyms through one-time address. Of independent interest, we propose a new primitive called committed key generation that converts committed message into public/private key paring, specifically, an ECDSA key pair used in the Bitcoin in our construction, with non-interactive zero-knowledge proof. This tool allows us to bind a committed file with a transaction in Bitcoin. With this approach, the proposed TTP-free scheme can be applied to a wide range of scenarios, as long as the signatures represent some items of value such as contract and electronic check. more...

Direct Anonymous Attestation is TPM2’s method of providing mathematically-proven anonymity or pseudonymity for signing keys in trusted platforms. The simple explanation of how DAA works is that it has a single verification (public) key but a plethora of signing (private) keys. One cannot tell which of many platforms created the signature. This chapter provides a more thorough explanation and enables one to understand (amongst other things) why one can’t tell whether two anonymous DAA signatures were created under the same private key, but can tell whether two pseudonymous DAA signatures were created under the same private key. This chapter is intended for readers with a background or interest in mathematics and/or cryptography. more...

Social network sites (SNS) have not only become a fundamental part of the Web, but also increasingly offer novel communicative and networking possibilities for academia. Following a short presentation of the typical functions of (science-specific) SNS, we firstly present the state of knowledge regarding academic usage practices, both in general purpose SNS and in science-specific SNS. Secondly, we assess potential impacts by addressing identified key issues such as privacy, the role of pseudonymity, and the specific form of informal communication in question. In particular, we focus on the issue of network effects and the challenge of multiple channels, which presents itself as a major hurdle for an effective implementation of SNS in academia. Despite these difficulties, we come to the conclusion that SNS are, in principle, functional for scholarly communication and that they have serious potential within academia. more...