This lesson talks about the secret codes and the examples of different kinds of it. There are transposition ciphers, block ciphers, substitution ciphers and book ciphers. The most special one is substitution ciphers which is tricked by Mary, Queen of Scots, using her own secret code. In this lesson, I realize how the code work and it is also intered.
outside reading
Quantum leap for secret codes
http://news.bbc.co.uk/1/hi/technology/2963138.stm
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