1. Introduction Joppe W. Bos, Arjen K. Lenstra, Herman te Riele and Daniel Shumow; 2. Montgomery arithmetic from a software perspective Joppe W. Bos and Peter L. Montgomery; 3. Hardware aspects of Montgomery modular multiplication Colin D. Walter; 4. Montgomery curves and the Montgomery ladder Daniel J. Bernstein and Tanja Lange; 5. General purpose integer factoring Arjen K. Lenstra; 6. Polynomial selection for the number field sieve Thorsten Kleinjung; 7. The block lanczos algorithm Emmanuel Thomé; 8. FFT extension for algebraic-group factorization algorithms Richard P. Brent, Alexander Kruppa and Paul Zimmermann; 9. Cryptographic pairings Kristin Lauter and Michael Naehrig.