@misc{cryptoeprint:2007:249, author = {Serge Fehr and Christian Schaffner}, title = {Randomness Extraction via Delta-Biased Masking in the Presence of a Quantum Attacker}, howpublished = {Cryptology ePrint Archive, Report 2007/249}, year = {2007}, url = {http://eprint.iacr.org/2007/249}, }