Susan Wiedenbeck: PassPoints: Design and Longitudinal Evaluation of a Graphical Password System
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タイトル
ソース
International Journal of Human-Computer Studies Vol.63, No.1-2
ページ
102-127
年
2005
ISBN
著者
概要
Computer security depends largely on passwords to authenticate human users. However, users have difficulty remembering passwords over time if they choose a secure password, i.e. a password that is long and random. Therefore, they tend to choose short and insecure passwords. Graphical passwords, which consist of clicking on images rather than typing alphanumeric strings, may help to overcome the problem of creating secure and memorable passwords. In this paper we describe PassPoints, a new and more secure graphical password system. We report an empirical study comparing the use of PassPoints to alphanumeric passwords. Participants created and practiced either an alphanumeric or graphical password.
The participants subsequently carried out three longitudinal trials to input their password over the course of 6 weeks. The results show that the graphical password users created a valid password with fewer difficulties than the alphanumeric users. However, the graphical users took longer and made more invalid password inputs than the alphanumeric users while practicing their passwords. In the longitudinal trials the two groups performed similarly on memory of their password, but the graphical group took more time to input a password.
内容
PasslogixやGATESCENEでは画面上の選択可能なオブジェクトが限られている．結果として，パスワードとして使用できるシーケンスの組合せが少ない．これに対し，PassPoints19）は，特定のオブジェクトにこだわることなく図の任意の位置を誤差2.5mmの範囲内で選択可能とした(図-6)．図において黒い正方形で表されている領域がユーザの登録した点であり，その順番が数字で示されている．ただし，実際の認証時にはこの正方形や数字は表示されない． コメント
増井俊之.icon
どこをクリックすべきかなんて覚えていられるわけがないじゃないか!
6週間では全然長期的といえないと思うけど