4,746 research outputs found
A Survey of Digital Watermarking Techniques and its Applications
Digital media is the need of a people now a day as the alternate of paper
media.As the technology grown up digital media required protection while
transferring through internet or others mediums.Watermarking techniques have
been developed to fulfill this requirement.This paper aims to provide a
detailed survey of all watermarking techniques specially focuses on image
watermarking types and its applications in today world.Comment: 4 Page
Synesthesia: Detecting Screen Content via Remote Acoustic Side Channels
We show that subtle acoustic noises emanating from within computer screens
can be used to detect the content displayed on the screens. This sound can be
picked up by ordinary microphones built into webcams or screens, and is
inadvertently transmitted to other parties, e.g., during a videoconference call
or archived recordings. It can also be recorded by a smartphone or "smart
speaker" placed on a desk next to the screen, or from as far as 10 meters away
using a parabolic microphone.
Empirically demonstrating various attack scenarios, we show how this channel
can be used for real-time detection of on-screen text, or users' input into
on-screen virtual keyboards. We also demonstrate how an attacker can analyze
the audio received during video call (e.g., on Google Hangout) to infer whether
the other side is browsing the web in lieu of watching the video call, and
which web site is displayed on their screen
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