Prerequisites for

Cryptanalysis of Number Theoretic Ciphers
Wagstaff Jr., Samuel S. / Atallah, Mikhail J. (Editor). 2003. 318 pages.
Categories: Cryptanalysis, Mathematics, Newly Added Books
Haven't finished reading this book yet.
Even so, it appears that despite the title (an emphasis on "Cryptanalysis"), it seems to only contains 22 pages on how one might actually attack cryptosystems.

Recommended prerequisite books:
Both of these books:   
       
(Read review)
       
(Read review)
Suggested mathematical background in:

-  Calculus
Suggested computer language experience:

N/A