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Digital money is one of payment instruments invented for
electronic commerce. One major advantage of using this
instrument is that the privacy of users, who hold or pay digital
money, can be well protected. Such strength of privacy
protection may be abused by outlaws, however. In recent
developments of digital money, there have been several efforts
trying to protect users'' privacy and , in the meantime, to
provide necessary traceability for the purpose of law
enforcement.In this thesis, the author offers a comprehensive
survey of the stateof the art. He also offers the design of a
new system, called Hidden-Identity-Attached Digital Money
System(HIADMA), which hides theholder''s identity in an
attachment to the digital money. As other scheme, HIADMS depends
on a law enforcement unit, that is a Trusted Third Party (TTY),
to decipher the identity of a user when necessary. Without the
intervention of the Trusted Third Party, the anonymity of users
remains well protected. The intervention must be regulated by
laws. Instead of using sophisticated mathematics as that in
other schemes, HIADMS uses cryptographic primitives that have
been known as international standards. The rapid development of
electronic commerce has created strong demands of
standardization of those of those cryptographic primitives.
Because of this strategy, our approach wouldbe more intelligible
to the general public and is feasible of implementation in the
real world.
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