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TIP
2002
97views more  TIP 2002»
13 years 4 months ago
Affine invariants of convex polygons
In this correspondence, we prove that the affine invariants proposed recently by Yang and Cohen [1] are algebraically dependent. We show how to select an independent and complete s...
Jan Flusser
AMC
2005
154views more  AMC 2005»
13 years 4 months ago
An improvement of the Yang-Shieh password authentication schemes
Recently, Yang and Shieh proposed two password authentication schemes by employing smart cards. One is a timestamp-based password authentication scheme and the other is a nonce-ba...
Chou Chen Yang, Ren-Chiun Wang, Ting Yi Chang