Steganography#
Steganography is the practice of hiding a message so it is unnoticeable to a potential eavesdropper. Some common practices used over the years have included:
hiding a message behind the wax portion of a writing tablet (Ancient Greece)
writing your message behind a postage stamp before mailing
using invisible inks.
The benefit of steganography is that an enemy eavesdropper does not know that a message is being sent, and therefore can not intercept and read it. This course focuses on cryptography and cryptanalysis, not steganography.