title = {Know why your access was denied: regulating feedback for usable security},
author = {Apu Kapadia and Geetanjali Sampemane and Roy H. Campbell},
institution = {Univ. of Illinois, Urbana-Champaign, Dept. of Computer Science},
number = {UIUCDCS-R-2004-2406},
month = {Feb},
year = {2004},
url = {http://choices.cs.uiuc.edu/~akapadia/papers/know.pdf}}

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