Last Updated：2025/12/31
Sentence
Touch
screens
are
touched,
so
oily
residues,
or
smudges,
remain
on
the
screen
as
a
side
effect.
Latent
smudges
may
be
usable
to
infer
recently
and
frequently
touched
areas
of
the
screen
–
a
form
of
information
leakage.
This
paper
explores
the
feasibility
of
smudge
attacks,
where
an
attacker,
by
inspection
of
smudges,
attempts
to
extract
sensitive
information
about
recent
user
input.
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Touch screens are touched, so oily residues, or smudges, remain on the screen as a side effect. Latent smudges may be usable to infer recently and frequently touched areas of the screen – a form of information leakage. This paper explores the feasibility of smudge attacks, where an attacker, by inspection of smudges, attempts to extract sensitive information about recent user input.
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