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math.CO2013
A new look at an old construction: constructing (simple) 3-designs from resolvable 2-designs
Douglas R. Stinson, Colleen M. Swanson, Tran van Trung
In 1963, Shrikhande and Raghavarao published a recursive construction for designs that starts with a resolvable design (the "master design") and then uses a second design (the "ind…
math.CO2012
Combinatorial Solutions Providing Improved Security for the Generalized Russian Cards Problem
Colleen M. Swanson, Douglas R. Stinson
We present the first formal mathematical presentation of the generalized Russian cards problem, and provide rigorous security definitions that capture both basic and extended versi…