| 摘要 |
<p>PROBLEM TO BE SOLVED: To actualize message verification capable of identifying a transmission source with a light load.SOLUTION: A radio device generates a first packet signal to which a public key certificate proper to the transmission source, a representative value list, application data, a signature capable of verifying with the public key included in the public key certificate, and a message authentication code by a common key encryption method are added. The radio device also generates a second packet signal to which the digest of the public key certificate proper to the transmission source, the application data and the message authentication code by the common key encryption method are added. Based on the results of the verifications of the signature and the message authentication code, and the comparison of the representative value, the radio device determines whether or not to approve a message constituting the application data.</p> |
