Florencio: A large-scale study of web password habits

http://research.microsoft.com/en-us/um/people/cormac/papers/www2007.pdf http://gyazo.com/35a8d7e9a2dda723087fcb29164196bc.png

タイトル

ソース

Proceedings of the 16th international conference on World Wide Web

Banff, Alberta, Canada

ページ

657-666

年

2007

ISBN

978-1-59593-654-7

著者

Abstract

We report the results of a large scale study of password use and password re-use habits. The study involved half a million users over a three month period. A client component on users’ machines recorded a variety of password strength, usage and frequency metrics. This allows us to measure or estimate such quantities as the average number of passwords and average number of accounts each user has, how many passwords she types per day, how often passwords are shared among sites, and how often they are forgotten. We get extremely detailed data on password strength, the types and lengths of passwords chosen, and how they vary by site. The data is the first large scale study of its kind, and yields numerous other insights into the rˆole the passwords play in users’ online experience.

内容

ひとりあたり6.5個のパスワードを利用

各パスワードが3.9個のサイトで共有されている

パスワードが必要なサイトを25個利用

1日8回パスワードを打つ

3ヶ月の間に4.28%のユーザがパスワードを忘れた

コメント

人はパスワードをどれぐらい忘れるものかという統計資料として有用なのだろう

誰でも20回に1回はパスワードを忘れるということになるので。