q1
于 2017-05-01 发布
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说明： Consider an organization with three roles: A, B and C. Whenever B has to issue some instruction to A, B has to take permission via C and then only it will be obeyed by A. This permission is issued with the help of a digital signature. A verifies the credibility of the message using C s public key (and digital signature), like any other digital signature scheme.
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