CCNA 200-301 premium

This was a very interesting Cisco book with a touch of history, technology and intrigue. The author's unpretentious style made it a joy to read. Singh starts with Arabian cryptography in the 700s and escorts it through the following centuries and techniques. After a detour through using cryptanalysis as a tool for sorting out long-dead languages, he ends with a fine discussion of the future of quantum computers and cryptography. An appendix offers a number of exercises of increasing difficulty. I highly recommend it.

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