Redistribution of mechanical secret shares

Yvo Desmedt*, Rei Safavi-Naini, Huaxiong Wang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

1 Citation (Scopus)


Vaults are used extensively in the financial world. Some of these vaults use a secret sharing scheme in which the shares are mechanical keys. Reorganization of a corporation sometimes requires to change the access structure of those authorized to open the vault. Although changing access structure is studied in the context of secret sharing schemes, the techniques are inadequate in the case that the shares are mechanical keys. For example, some schemes require that an existing secret sharing scheme (vault in our case) be fitted with new sets of shares (mechanical keys in our case). That is a number of share sets (key sets) be produced that open the same vault. Making such a modification to a mechanical vault is very expensive, if at all possible. We study how one can redistribute secret shares only by using copying of these shares, which is the only operation one can allow to deal with mechanical shares without changing the mechanical vault mechanism.

Original languageEnglish
Title of host publicationFinancial Cryptography - 6th International Conference, FC 2002, Revised Papers
EditorsMatt Blaze
Place of PublicationBerlin; Heidelberg
PublisherSpringer, Springer Nature
Number of pages15
ISBN (Electronic)9783540365044
ISBN (Print)9783540006466
Publication statusPublished - 2003
Event6th International Financial Cryptography Conference, FC - 2002 - Southampton, Bermuda
Duration: 11 Mar 200214 Mar 2002

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN (Print)03029743
ISSN (Electronic)16113349


Other6th International Financial Cryptography Conference, FC - 2002


  • Combinatorics
  • Cover-free family
  • Secret sharing


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