Incoercible secure electronic voting scheme using chaffing and winnowing
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Date
2002-08
Authors
Chin Kiong, Ng
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Abstract
Traditional paper ballot election is facing multitude of problems, good examples are the
controversial behind United State Presidential Election 2000 and Malaysia local byelections
at Pendang and Lunas. These focus the public attention on the need to combat
voting fraud while ensuring that no qualified voters are disenfranchised and the need for
an accurate counting" of votes. Simple point-and-click electronic elections or Internet
elections may seem an attractive 21st Century alternative to traditional paper voting
systems, in view of the growing usage of personal computer and the Internet. Since the
preliminary proposal o f electronic voting scheme by D avid C haum, researchers have
proposed many schemes. However, among the -security requirements few are still
unsatisfactory, coercion fraud being one of those remains unsolved, at least not without
some fotrn of physical assumptions.
This thesis bring forth an incoercible electronic voting scheme based on blind signature
and mix -type anonymous channel, which is autonomous of any physical a ssurnption.
a.Ild at the s~e_ time does not strain the by now ~?mple_x voti~g scheme. Oll.f solution
utilizes the combination of symmetric encryption and Rivest's steganography technique
-chaffing and winnowing (C&W). In contrast to encryption, steganography employing
message digest that consumes much less computation power, space and time; similar
case for symmetric encryption compare to asymmetric encryption, which is an added
advantage consider the amount of voter-generated traffics. Using C&W, voters could
present the ·coercer with fake encryption keys that produce different voting strategies.
Thus, the c oercer would not convince oft he ballot presented and could not act with
certainty of success, consequently vote buying and extortion is resolved without
sacrificing other security requirements.
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Keywords
Secure electronic voting , Using chaffing , Winnowing