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 If you are new to cryptography, you can make a good start by reading Crypto by Steven Levy. The book is fun read, tells about the lives of the people who made cryptographic discoveries, and along the way you know why the knapsack problem and many other fun and entertaining math problems are central to cryptography.  

 Next, you may want to jump straight to the surprisingly easy and fun basic math. Modern cryptography is based upon decision problems, meaning problems that have an answer or either yes, no, or "I can't tell!!!" "Computers and Intractability: A Guide to the Theory of NP-Completeness" is brilliant, yet easy to read and understand.

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