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Fastwords. Markus Jakobsson Ruj Akavipat. A Bit about Authentication. Difficulty customizing settings. Difficulty authenticating. Short battery life. Lack of coverage. 1 2 3 4 5. - PowerPoint PPT Presentation
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FastwordsMarkus Jakobsson
Ruj Akavipat
A Bit about Authentication
2
1 2 3 4 5
Short battery life
Slow Web connection
Lack of coverage
Poor voice quality
Small screen
size
Difficulty customizing
settings
Difficulty authenticating
Jakobsson/Akavipat: www.fastword.me
People hate passwords – especially on handsets
• Slow to enter … … and then you realize you mistyped something!
• At the same time, recall rates are low for passwords … and reset is difficult / insecure / expensive
• PINs are faster … … but not very secure … and reuse is rampant
Problems
Jakobsson/Akavipat: www.fastword.me
Q. Why are passwords more painful than text? A. Text uses auto-correction/completion!
Understanding usability issues
Jakobsson/Akavipat: www.fastword.me
Q. Why are (good) passwords hard to recall? A. Good passwords are weird!
(Ebbinghausen, 1885)
Understanding recall issues
Jakobsson/Akavipat: www.fastword.me
Not so secure, you say?Approx. 64k words only.
Auto correct works
frogfroffrofrffrof
A stab at a solution
Jakobsson/Akavipat: www.fastword.me
Auto correct works
frog flat work
Improved solution
Jakobsson/Akavipat: www.fastword.me
Looking at speed
Jakobsson/Akavipat: www.fastword.me
Average password
Average fastword
Looking at security
Jakobsson/Akavipat: www.fastword.meEFFECTIVE RECALL: 0.36+(1-0.36)*0.48=0.67 …. 67%
Forgot fastword? Hint: first word
Jakobsson/Akavipat: www.fastword.me
Average fastword
Average password
Forgot fastword? Hint: first word
We can improve as basic things as passwords – if we ask “why”.
Jakobsson/Akavipat: www.fastword.me
Big-picture insight