the content of this book is a little odd: it seems narrowly oriented towards getting enough number theory to understand RSA, Diffie-Hellman, and elliptic curve cryptography.<p>i very much enjoy a book with the same title but by burton:<p><a href="http://www.mcgraw-hill.co.uk/html/0071244255.html" rel="nofollow">http://www.mcgraw-hill.co.uk/html/0071244255.html</a><p>it contains a lot more of number theory and a little cryptography too.