The growing World-Wide Web requires scientific research to strengthen and extend design guidelines. Exploratory research was undertaken to investigate the relationship between (1) site size and structure and (2) user navigation and perception. Experimental results showed that strongly hierarchical sites are more usable; site size has little effect on user navigation and mental models; nodes hig...

We use an information-theoretic framework to quantify context differences and image distinctiveness for predicting image memorability. We are able to quantify, using a large natural scene database, the observation that images that are unique or distinct with respect to their image context are better remembered.

Password systems have fallen under several attacks in the last decade. Shoulder surfing, key logging, brute force attack and many others have been identified as threats for the security of systems. The conventional (traditional text passwords) are often forgotten by users. In view of this, users often write them down on sheet of paper or any other surface for memorability. Users

This paper studies the security and memorability of free-form multitouch gestures for mobile authentication. Towards this end, we collected a dataset with a generate-test-retest paradigm where participants (N=63) generated free-form gestures, repeated them, and were later retested for memory. Half of the participants decided to generate one-finger gestures, and the other half generated multi-fi...

User-generated passwords tend to be memorable, but not secure. A random, computergenerated 60-bit string is much more secure. However, users cannot memorize random 60bit strings. In this paper, we investigate methods for converting arbitrary bit strings into English word sequences (both prose and poetry), and we study their memorability and other properties.

GRAPHICAL PASSWORD IS A SECRET THAT A HUMAN USER INPUTS TO A COMPUTER WITH THE AID OF the computer’s graphical input (e.g., mouse, stylus, or touch screen) and output devices. In this chapter, we review the arguments supporting graphical passwords as being potentially superior to text passwords, present several graphical password designs, and discuss some analyses of graphical password memorabi...

The mirror effect refers to the common finding that hit and false alarm rates on a recognition test are inversely related. The present research investigated the generality of the mirror effect (to rare words) and tested whether the effect might be grounded in accurate estimates of word memorability. The first 2 experiments showed that although high- and low-frequency words exhibit a mirror effe...