document (individual) watermarking and eventual counter measures

phabricator-migrator · February 19, 2024, 5:47pm

Information

ID: 450
PHID: PHID-TASK-zoq4vzmisw3ibwraywrg
Author: Patrick
Status at Migration Time: resolved
Priority at Migration Time: Normal

Description

Document (individual) watermarking and eventual counter measures.

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HulaHoop

2015-12-08 00:48:30 UTC

Here is the watermarking section. Where should I add it?

Watermarking is a subset of the science of stenagoraphy. It can apply to any type of digital media. Goals of watermarking are to trace back information leaks to a source. This is done by embedding covert data into the “noise” of data imperceptible to humans. A digital watermark is said to be robust if it remains intact even if modifications are made to the files.Digital watermarking - Wikipedia

A good countermeasure is to run documents through an OCR and share the output instead.

According to a talk by Sarah Harrison from WikiLeaks, source tracing can happen through much simpler techniques such as looking at access lists for the materials. For example if only three people have access to a set of documents then the hunt is narrowed down considerably.

Patrick

2015-12-08 18:26:45 UTC

HulaHoop

2015-12-08 19:30:56 UTC