Abstract
The Virtual Software Token Protocol was proposed by Know as a practical method for secure public key infrastructure roaming. However, he recently found a weakness of the protocol under the original assumption, and proposed two revised versions, namely refinement and improvement, which lost the desirable properties of scalability and efficiency respectively. In this letter, a secure improvement is proposed for better performance in both scalability and efficiency. Unlike the author's improvement, our improvement provides parallel execution as the original protocol did.
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