The use of colour in user interfaces is extensive. It is typically a usability issue, and has rarely caused any security failures. In this article, we show that the use of colours in the design of CAPTCHA, a standard security technology that has found widespread applications in commercial websites, can have impact on usability and interesting but critical implications on security.

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PrePrint: CAPTCHA design: colour, usability and security

In previous issues, we highlighted the impact that different durations of IP packet loss have on the quality of experience for IP-based video streaming services.

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PrePrint: Towards Lossless Video Transport

This article presents the Software Architecture for Immersipresence (SAI) framework for the design, analysis and implementation of interactive software systems. SAI defines an architectural style whose data and processing models capture temporal properties of computational primitives.

This article describes a mixed reality learning experience for the learning of Spanish as a foreign language which takes place on a virtual world that mirrors a boulevard in Madrid. To this end, we have extended the capabilities of an open source multi-user 3D virtual world platform to orchestrate learning activities and to use augmented reality and augmented virtuality.

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PrePrint: Connecting Virtual Worlds with the Real World for Learning a Foreign Language

Health information sharing has become a vital part of modern healthcare delivery. E-health technologies provide efficient and effective ways of sharing medical information, but give rise to issues that neither the medical professional nor the consumers have control over. Information security and patient privacy are key impediments that hinder sharing information as sensitive as health information

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PrePrint: Sharing with Care: An Information Accountability Perspective