Arjen K. Lenstra Igor Shparlinski On the Security of Lenstra's Variant of DSA without Long Inversions. 64-72 http://link.springer.de/link/service/series/0558/bibs/1992/19920064.htm 2001 conf/pkc/2001 Public Key Cryptography db/conf/pkc/pkc2001.html#LenstraS01