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There is a natural intuitive match between anonymity and information theory. In particular, the maximal anonymity loss in anonymity protocols can be matched to the information theoretical notion of channel capacity.However, there is also a significant mismatch between the theories and reality: current theories can only characterize channel capacity based upon certain assumptions of symmetry, which are rarely satisfied in the real world.This paper aims to resolve this mismatch by appealing to powerful mathematical techniques. A generic methodology using Lagrange multiplier method is proposed to characterize channel capacity in anonymity protocols.This Lagrangian approach is proved to be able to generalize previous work on the channel capacity of protocols. Further, we present analyses on three well known protocols, namely Dining Cryptographers, Crowds and Onion Routing to demonstrate the application of our methodology.

Energetic positive and negative cloud‐to‐ground (CG) flashes are both capable of producing sprites. Negative CGs typically outnumber the positive ones by 10 to 1. However, >99.9 % of reported sprites were found to be initiated by positive CGs—thus the polarity paradox. Here, sprites recorded by the Imager of Sprites and Upper Atmospheric Lightning (ISUAL) mission were analyzed along with extremely low‐frequency band magnetic field data to resolve this paradox. Approximately twenty‐five percent of the sprites are found to be associated with negative CG lightning. “Negative” sprites mainly congregate in the latitudinal regions below 20°, while positive sprites scatter up to 50°. The ISUAL negative sprites are evidently beyond the observable ranges of the ground sites reported in previous studies. Hence, the sprite polarity paradox is likely a selection effect of the middle‐ to high‐altitudinal observation sites. The charge moment changes and accompanying transient luminous events of sprites were also examined and found to be polarity dependent.

PurposeSocial media (SoMe) influencer marketing is a popular practice. The current study examines the interplays between SoMe influencers' source credibility, Millennial users' attitudes and intention to travel. It further investigates the moderating role of SoMe influencer following behavior on the aforementioned relationships.Design/methodology/approachA total of 212 useable responses were collected through an online survey. Structural equation modeling and hierarchical multiple regressions were employed for hypotheses testing.FindingsResults indicated that source credibility had a significantly positive influence on the SoMe users' attitudes, which in turn was positively associated with the intention to visit the endorsed destination. Moreover, both relationships were strengthened for SoMe influencer followers than for nonfollowers.Originality/valueThe study expanded the source credibility theory to the use of SoMe influencer marketing on travel destinations among Millennial SoMe users. In addition, the research applied the self-determination theory to fill the gap in literature by examining the moderating role of SoMe influencer following behavior.

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The functional value experience of family tourism has often been paid attention both by tourists themselves and the tourism industry, but the individual value experience of parents in family tourism has been neglected. Family tourism shifts the scenario of interpersonal interaction between families from home, the conventional environment, to a non-conventional one. This change in the interactive situation will inevitably bring about changes in interpersonal interaction behavior and individual perception, especially to tourists who take on the role of parents in a nuclear family. This study enriches the examination of the family tourism experience by exploring the interpersonal interaction, existential authenticity travel experiences, and quality of tourist experience perceived by parents in family tourism. The main findings are: 1) In the non-conventional environment of tourism, effective interaction between tourists and their families helps to improve tourists’ emotional experience and satisfaction; 2) Three aspects of existential authenticity are the internal causes of the impact of interpersonal interaction on emotional experience and satisfaction; 3) Differences in parental roles make important discrepancies between men and women’s perception of family tourism experiences. This study provides insights to understanding the family tourism market and brings valuable findings to the area of family tourism marketing and management.