Will You Trust This TLS Certificate?

I Will Forgive You--This Time.

Although adenocarcinoma of the prostate persists in being the most common form of cancer in men, its clinical behavior does not maintain this type of consistency, wavering from extremely aggressive fatal cancers to clinically insignificant, incidental entities. The prevalence of prostate cancer at autopsy is remarkably high, increasing from 20% in men in their 50s to up to 80% in men 70 to 80 y...

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Practical Issues with TLS Client Certificate Authentication

The most widely used secure Internet communication standard TLS (Transport Layer Security) has an optional client certificate authentication feature that in theory has significant security advantages over HTML form-based password authentication. In this paper we discuss practical security and usability issues related to TLS client certificate authentication stemming from the server side and bro...

When Will You Answer This? Estimating Response Time in Twitter

We present a study analyzing the response times of users to questions on Twitter. We investigate estimating these response times using an exponential distribution-based wait time model learned from users’ previous responses. Our analysis considers several different model building approaches, including personalized models for each user, general models built for all users, and time-sensitive mode...

GeoPKI: Converting Spatial Trust into Certificate Trust

The goal of GeoPKI is to enable secure certificate validation (without user interaction) for situations in which a user interacts with an online entity associated with the physical space where the the user trusts (and usually is currently located). GeoPKI enables the owner of a space to associate a certificate with that space, and enables space-based certificate lookup to set up a secure channe...