Communication device, communication method, and computer program product

摘要

According to an embodiment, a communication device includes a first manager, and a second manager, a first communication unit, a determination unit, a controller, and a second communication unit. The first manager shares a first cryptographic key with a first external device connected via a link. The second manager shares a second cryptographic key to be provided to an application, with the first external device and with a second external device connected via links. The first communication unit transmits the second cryptographic key to the first external device. The determination unit determines whether a device with which the second cryptographic key is to be shared is the first external device. If it is affirmative, the controller controls the second manager to share, as the second cryptographic key, a cryptographic key obtained by converting the first cryptographic key. The second communication unit provides the application with the second cryptographic key.

主权项

1. A communication device comprising:
a first manager to share a first cryptographic key with a first external device that is connected via a link; a second manager to share a second cryptographic key that is provided to an application, with the first external device and with a second external device that is connected via a plurality of links; a first communication unit to transmit to the first external device, the second cryptographic key being encrypted using the first cryptographic key; a determination unit to determine whether a device with which the second cryptographic key is to be shared is the first external device; a controller to control the second manager to share, as the second cryptographic key, a cryptographic key that is obtained by converting the first cryptographic key, when the device with which the second cryptographic key is to be shared is the first external device; and a second communication unit to provide the application with the second cryptographic key, wherein the controller further controls the second manager to convert the first cryptographic key when at least one of
a residual quantity of the first cryptographic key is equal to or greater than a first threshold, andfrequency of use of the first cryptographic key in encryption of the second cryptographic key is equal to or less than a second threshold.