COMMUNICATION DEVICE, COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND COMPUTER PROGRAM PRODUCT
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United States of America Patent
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Issued Date -
Dec 22, 2016
app pub date -
Feb 16, 2016
filing date -
Jun 18, 2015
priority date (Note) -
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Abstract
A first determining unit determines a period of time during which there is possibility of wiretapping of data present in a data communication channel connected to another communication device. A second determining unit determines, with a length of the period of time as unit of time, size of a cryptographic key used for encrypting data to be transmitted to the other communication device via the data communication channel during each unit of time. A first obtaining unit obtains a first cryptographic key having the size, from a first storing unit storing therein cryptographic keys shared with the other communication device. A recognizing unit recognizes possibility of wiretapping with respect to the data communication channel. Until the possibility of the wiretapping is recognized, a encrypting unit repeatedly encrypts data to be transmitted to the other communication device during each unit of time using the first cryptographic key.
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