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Title: Increased Resilience in Threshold Cryptography: Sharing a Secret with Devices That Cannot Store Shares
Authors: Simoens, Koen
Peeters, Roel
Preneel, Bart
Issue Date: 2010
Publisher: Springer-Verlag
Host Document: Lecture Notes in Computer Science vol:6487 pages:116-135
Conference: Pairing 2010 edition:4 location:Yamanaka Hot Spring, Japan date:December 13-15, 2010
Abstract: Threshold cryptography increases security and resilience by sharing a private
cryptographic key over different devices. Many personal devices, however, are
not suited for threshold schemes, because they do not offer secure storage,
which is needed to store shares of the private key. We present a solution that
allows to include devices without them having to store their share. Shares are stored
in protected form, possibly externally, which makes our solution suitable for low-cost
devices with a factory-embedded key, e.g., car keys and access cards. By using
pairings we achieve public verifiability in a wide range of protocols, which
removes the need for private channels. We demonstrate how to modify existing
discrete-log based threshold schemes to work in this setting. Our core result is
a new publicly verifiable distributed key generation protocol that is provably
secure against static adversaries and does not require all devices to be
present.
URI: 
ISBN: 978-3-642-17454-4
ISSN: 0302-9743
Publication status: published
KU Leuven publication type: IC
Appears in Collections:ESAT - STADIUS, Stadius Centre for Dynamical Systems, Signal Processing and Data Analytics

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