The purpose of this text is to instruct readers on how to implement double-precision algorithms efficiently. Bignum math is the backbone of modern computer security algorithms. This book introduces readers to the concept of bignum algorithms and proceeds to build a library of all functions from the bottom up. Through the use of theory, pseudo-code and actual fielded C source code the book explains each and every algorithm that goes into a modern bignum library. * Complete coverage Karatsuba Multiplication, Barrett Algorithm, Toom-Cook 3-Way Multiplication, and More * Tom St Denis is the developer of industry standard cryptographic suite of tools called LibTom.