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Wiktionary:
(computer security) a method used to crack the password of a touchscreen device by analysing the oily smears left on the device's screen by the user's fingers

ülevaateid
https://en.wikipedia.org/wiki/Smudge_attack

http://static.usenix.org/events/woot10/tech/full_papers/Aviv.pdf

http://mkhamis.com/data/papers/abdelrahman2017chi.pdf

tõrje
https://www.medien.ifi.lmu.de/pubdb/publications/pub/zezschwitz2013IUI/zezschwitz2013IUI.pdf

http://bkgsi.yonsei.ac.kr/bkgsi/pdf_paper/[2013]TinyLock%20-%20Affordable%20defense%20against%20smudge%20attacks%20on%20smartphone%20pattern%20lock%20systems.pdf

http://isyou.info/jowua/papers/jowua-v8n2-4.pdf