olemus
puuteekraani kaudu sisestatud paroolide vm konfidentsiaalse teabe paljastamine
- puutejälgede pildistamise ja
- pilditöötlustarkvara abil analüüsimise teel

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

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

http://cse.seu.edu.cn/PersonalPage/zhenling/publications_files/spsm2012_Fingerprint_Attack_against_Touch-enabled_Devices.pdf

tõrje
https://lifehacker.com/whats-the-best-way-to-prevent-touch-screen-smudge-atta-757563408

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