Authentication Entity Device, Verification Device and Authentication Request Device
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United States of America Patent
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app pub date -
May 19, 2014
filing date -
Jul 7, 2005
priority date (Note) -
Abandoned
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Abstract
A verification device transmits challenge information to a first entity device, and for each authentication context received in return, verifies that challenge information identical to the challenge information transmitted in advance is described, to thereby confirm that the authentication context is the current one. As a result, a repetitive attack in which the past authentication context is repeatedly used is prevented and the security against repetitive attacks is improved.
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