The ECDSA and the XTR-DSA module have a more complex arithmetic, therefore a lot more code is required. ... herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, ... A. available via http : //www . xbow . com/Support/Support _pdf _f iles/ MPR-MIB_Series_Users_Manual.pdf, June 2007. ... Guide to Elliptic Curve Cryptography.