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Publication Detail
Chaffinch: Confidentiality in the face of legal threats
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Clayton R, Danezis G
  • Publication date:
  • Pagination:
    70, 86
  • Journal:
    Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
  • Volume:
  • Status:
  • Print ISSN:
We present the design and rationale of a practical system for passing confidential messages. The mechanism is an adaptation of Rivest's "chaffing and winnowing", which has the legal advantage of using authentication keys to provide privacy. We identify a weakness in Rivest's particular choice of his "package transform" as an "all-or-nothing" element within his scheme. We extend the basic system to allow the passing of several messages concurrently. Only some of these messages need be divulged under legal duress, the other messages will be plausibly deniable. We show how this system may have some resilience to the type of legal attack inherent in the UK's Regulation of Investigatory Powers (RIP) Act. © Springer-Verlag Berlin Heidelberg 2003.
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