...This is the first book devoted to the study of the extensive cross-fertilization between stream ciphers and number theory. Many results in the book are new, and over seventy percent of the results described are based on recent research by the authors.
Cyptologia, Vol. XXIII, January 1999
...This is a cryptography book which focuses on methods for producing keystream sequences fpr stream ciphers.Mathematical Reviews, 1999
This book is a readable and important contribution for stimulating the interaction between stream ciphers and number theory.T. Helleseth, Zentralblatt fur Mathematik, Vol. 916, 1999