Card-computer moderated systems
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United States of America Patent
Stats
-
May 15, 1990
Issued Date -
N/A
app pub date -
May 24, 1988
filing date -
Aug 22, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A user controlled card computer C and communicating tamper-resistant part T are disclosed that conduct secure transactions with an external system S. All communication between T and S is moderated by C, who is able to prevent T and S from leaking any message or pre-arranged signals to each other. Additionally, S can verify that T is in immediate physical proximity. Even though S receives public key digital signatures through C that are checkable using public keys whose corresponding private keys are known only to a unique T, S is unable to learn which transactions involve which T. It is also possible for S to allow strictly limited messages to be communicated securely between S and T.
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