The objective of this paper is to give a comprehensive introduction to applied cryptography with an engineer or computer scientist in mind. The emphasis is on the knowledge needed to create practical systems which supports integrity, confidentiality, or authenticity. Topics covered includes an introduction to the concepts in cryptography, attacks against cryptographic systems, key use and handling, random bit generation, encryption modes, and message authentication codes. Recommendations on algorithms and further reading is given in the end of the paper. This paper should make the reader able to build, understand and evaluate system descriptions and designs based on the cryptographic components described in the paper.

[서평]「Applied Cryptography」

In two nationally representative surveys of U.S. adolescents in grades 8 through 12 (N = 506,820) and national statistics on suicide deaths for those ages 13 to 18, adolescents’ depressive symptoms, suicide-related outcomes, and suicide rates increased between 2010 and 2015, especially among females. Adolescents who spent more time on new media (including social media and electronic devices such as smartphones) were more likely to report mental health issues, and adolescents who spent more time on nonscreen activities (in-person social interaction, sports/exercise, homework, print media, and attending religious services) were less likely. Since 2010, iGen adolescents have spent more time on new media screen activities and less time on nonscreen activities, which may account for the increases in depression and suicide. In contrast, cyclical economic factors such as unemployment and the Dow Jones Index were not linked to depressive symptoms or suicide rates when matched by year.

Increases in Depressive Symptoms, Suicide-Related Outcomes, and Suicide Rates Among U.S. Adolescents After 2010 and Links to Increased New Media Screen Time:

Privacy attitudes and privacy behaviour

Social media allows people to freely interact with others and offers multiple ways for marketers to reach and engage with consumers. Considering the numerous ways social media affects individuals and businesses alike, in this article, the authors focus on where they believe the future of social media lies when considering marketing-related topics and issues. Drawing on academic research, discussions with industry leaders, and popular discourse, the authors identify nine themes, organized by predicted imminence (i.e., the immediate, near, and far futures), that they believe will meaningfully shape the future of social media through three lenses: consumer, industry, and public policy. Within each theme, the authors describe the digital landscape, present and discuss their predictions, and identify relevant future research directions for academics and practitioners.

/pdf/the-future-of-social-media-in-marketing-3imc734fnb.pdf

The future of social media in marketing.

Book Review: Folk Devils and Moral Panics: The Creation of the Mods and Rockers

Through communication technology, users find themselves constantly connected to others to such an extent that they routinely develop a mind-set of connectedness. This mind-set has been defined as o...

/pdf/the-relationship-between-online-vigilance-and-affective-well-1udtwuhecd.pdf

The Relationship Between Online Vigilance and Affective Well-Being in Everyday Life: Combining Smartphone Logging with Experience Sampling

This research report presents data from a study conducted in Germany based on a 3-year panel design. From October 2009 to April 2012, five waves of data collection were established. N = 327 participants from a convenience sample gave answers to questions regarding media use, privacy behaviors, well-being, social support, authenticity, and specific online experiences with a particular emphasis on social network sites (SNSs). It was found that across the 3 years of the study, people increasingly gained online social capital, developed a greater need for privacy, started to disclose more personal information online, and continually spent more time on SNSs. At the same time, people's willingness to disclose information in offline settings as well as their risk assessment of SNSs significantly decreased over time. Furthermore, frequent users of SNSs had more online social capital than less frequent users, disclosed more personal information online, knew more ways to restrict the access to their profiles, and were more authentic in their online profiles. People who had a higher need for privacy were less satisfied with their lives, less authentic in both their personal relationships and their online profiles, and generally showed more negative effects on different psychological variables. Respondents who had more online social capital also reported having more general positive affect and more offline social support.
In the research report, further results are reported: Each variable is presented both individually and in context with other measures. The study is the first longitudinal study on online privacy and as such the first to be able to report mutual causalities between online experiences and privacy behaviors.

/pdf/privacy-self-disclosure-social-support-and-social-network-1aqpt822f0.pdf

Privacy, self-disclosure, social support, and social network site use : research report of a three-year panel study

Research investigating the effect of new technologies on adolescents is more often characterized by media hype than sound science. We therefore welcome Foster and Jackson’s (1) consideration of this research area’s measurement practices because we believe a critical mindset benefits academic, civic, and industry stakeholders. While the authors raised important questions, however, the conclusions drawn by their letter are left unsupported by the available scientific evidence.

First, Foster and Jackson (1) posit that our findings are confounded because adolescents reported only weekday social media use, observing the engagement was “surprisingly low” (1). The amount of usage reported … 

[↵][1]1To whom correspondence may be addressed. Email: amy.orben{at}cantab.net.

 [1]: #xref-corresp-1-1

https://www.pnas.org/content/pnas/116/31/15334.full.pdf

Reply to Foster and Jackson: Open scientific practices are the way forward for social media effects research

In the recent decades, privacy scholarship has made significant progress. Most of it was achieved in monodisciplinary works. However, privacy has a deeply interdisciplinary nature. Most importantly...

/pdf/linking-loose-ends-an-interdisciplinary-privacy-and-gmji67yyn8.pdf

Linking loose ends: An interdisciplinary privacy and communication model:

It is often assumed that traditional forms of media such as books enhance well-being, whereas digital media do not. However, we lack evidence for such claims and media research is mainly focused on how much time people spend with a medium, but not whether someone used a medium or not. We investigated the effect of media use on well-being, differentiating time spent with a medium and use vs. nonuse, over a wide range of different media types: music, TV, films, video games, (e-)books, (digital) magazines, and audiobooks. Results from a six-week longitudinal study representative of the UK population (N = 2,159) showed that effects were generally small; between but rarely within people; mostly for use vs. nonuse and not time spent with a medium; and on affective well-being, not life satisfaction. Together, these results do not support policies intended to encourage or discourage media use because of effects on well-being.

/pdf/no-effect-of-different-types-of-media-on-well-being-w554ni9n0m.pdf

Tobias Dienlin

Papers

The Relationship Between Online Vigilance and Affective Well-Being in Everyday Life: Combining Smartphone Logging with Experience Sampling

Privacy, self-disclosure, social support, and social network site use : research report of a three-year panel study

Reply to Foster and Jackson: Open scientific practices are the way forward for social media effects research

Linking loose ends: An interdisciplinary privacy and communication model:

No effect of different types of media on well-being