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Paper 2004/178

Optimal Updating of Ideal Threshold Schemes

S. G. Barwick and W.-A. Jackson and K. M. Martin and C. M. O'Keefe

Abstract

We consider the problem of changing the parameters of an established ideal $(k,n)$-threshold scheme without the use of secure channels. We identify the parameters $(k',n')$ to which such a scheme can be updated by means of a broadcast message and then prove a lower bound on the size of the relevant broadcast. The tightness of this bound is demonstrated by describing an optimal procedure for updating the parameters of an ideal scheme.

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Publication info
Published elsewhere. Unknown where it was published
Keywords
Cryptologythreshold schemesdynamic secret sharingdistributed cryptosystems
Contact author(s)
sbarwick @ maths adelaide edu au
History
2004-07-26: received
Short URL
https://ia.cr/2004/178
License
Creative Commons Attribution
CC BY
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