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Whereas cryptography might try to ensure the confidentiality of data by encrypting it, the topic of steganography relates to hiding data: the premise is that for some applications, preventing the data being found is as important as preventing it being understood (or decrypted).
Although the topic alone is interesting, it allows an introduction to how computers represent and process images (e.g., those taken using a digital camera). Focusing on rasterised and vector images, two types of simple steganographic techniques are introduced: both allow one to embed a message within the image, while retaining the image and hence hiding the presence of a message.
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