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Python for Secret Agents
book

Python for Secret Agents

by Steven F. Lott
August 2014
Beginner to intermediate content levelBeginner to intermediate
216 pages
5h 13m
English
Packt Publishing
Content preview from Python for Secret Agents

Some approaches to steganography

There are many more things we can do with image files. One thing we can do is use steganography to conceal messages inside image files. As image files are large, complex, and relatively noisy, adding a few extra bits of data won't make much of a visible change to the image or the file.

Sometimes this is summarized as adding a digital watermark to an image. We're going to subtly alter the image in a way that we can recognize and recover it later.

Adding a message can be seen as a lossy modification to the image. Some of the original pixels will be unrecoverable. As the JPEG compression, in general, already involves minor losses, tweaking the image as part of steganography will be a similar level of image corruption. ...

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Publisher Resources

ISBN: 9781783980420Supplemental Content