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Dutta and Mukhopadhyay have recently proposed some very efficient
self-healing key distribution schemes with revocation. The
parameters of these schemes contradict some results (lower bounds)
presented by Blundo et al. In this paper different attacks against
the schemes of Dutta and Mukhopadhyay are explained: one of them
can be easily avoided with a slight modification in the schemes,
but the other one is really serious. The conclusion is that the
results of Dutta and Mukhopadhyay are wrong. http://eprint.iacr.org/2008/351