Stefan Lucks is a researcher in the fields of communications security and cryptography. Lucks is known for his attack on Triple DES, and for extending Lars Knudsen's Square attack to Twofish, a cipher outside the Square family, thus generalising the attack into integral cryptanalysis. He has also co-authored attacks on AES, LEVIATHAN, and the E0 cipher used in Bluetooth devices, as well as publishing strong password-based key agreement schemes.
Lucks graduated from the University of Dortmund in 1992, and received his PhD at the Georg-August-Universität, Göttingen in 1997. After leaving the University of Mannheim Lucks now heads the Chair of Media Security at Bauhaus-University Weimar.
Together with Niels Ferguson, Bruce Schneier and others he developed the Skein hash function as a candidate for the NIST hash function competition.