Patent ID: 8588424
Filing Date: 2013-11-19
Classification: H04L

Abstract:
1. A communication apparatus, comprising: a data transmitting/receiving unit that transmits data to and receives data from another communication apparatus; a plain text data processing unit that edits plain text data; an encryption key generation unit that generates encryption key information at constant encryption key generation intervals; a common key generation unit that generates common key information uniquely with respect to a generation time as the common key information common among communication apparatuses at common key generation intervals set longer than the encryption key generation intervals; a common key application unit that performs encryption of the encryption key information generated by the encryption key generation unit or decryption of encryption key information received from another communication apparatus using the common key information generated by the common key generation unit, the encryption key information received from the another communication apparatus being encrypted by common key information generated therein; and an encryption key distribution unit that makes a request to the data transmitting/receiving unit to distribute the encryption key information encrypted by the common key application unit to all communication apparatuses to be communicated at encryption key distribution intervals set shorter than the encryption key generation intervals.