1How can I break an encrypted message? And other introductory questions
The postcard in Figure 1-1 (provided to us by Karsten Hansky) was sent in 1904.1 As can be easily seen, the message written on it is encrypted.
Figure 1-1: Apparently, the sender of this postcard didn’t want the letter carrier or the family of the recipient to read it. So, they chose to encrypt the message.
Decades- or even centuries-old encrypted messages are far from unusual. Countless encrypted diaries, letters, notebooks, radio messages, newspaper ads, and telegrams ...
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