Improved Meet-in-the-Middle Attacks on Reduced-Round DES.

Orr Dunkelman Gautham Sekar Bart Preneel Improved Meet-in-the-Middle Attacks on Reduced-Round DES. 86-100 2007 conf/indocrypt/2007 INDOCRYPT http://dx.doi.org/10.1007/978-3-540-77026-8_8 db/conf/indocrypt/indocrypt2007.html#DunkelmanSP07