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OwnerMasaaki Takase, Mitsuaki Kakemizu +6inventors
InventorsMasaaki Takase, Mitsuaki Kakemizu, Yoichiro Igarashi, Hiroyuki Taniguchi, Shinya Yamamura, Katsunori Iwamoto, Hiraku Koganemaru, Hiroshi Wakameda
Estimating the term…
In a system for performing encryption communications using a common key updated at a predetermined timing between a key transmitting device and a key receiving device, a common key encryption communication system comprising: a key transmitting device including first retaining unit for retaining a most-updated encryption key and a one-generation-anterior encryption key as the above common keys, and first setting unit for setting a one-generation-anterior encryption key for transmission and a most-updated encryption key and a one-generation-anterior encryption key for receipt, respectively; and the above key receiving device including second retaining unit for retaining a most-updated encryption key and a one-generation-anterior encryption key as the above common keys, and second setting unit for setting a most-updated encryption key for transmission, and a most-updated encryption key and a one-generation-anterior key for receipt, respectively.
In a system for performing encryption communications using a common key updated at a predetermined timing between a key transmitting device and a key receiving device, a common key encryption communication system comprising:
In a key transmitting device performing encryption communications using a common key updated at a predetermined timing with a key receiving device, a key transmitting device comprising retaining unit retaining a most-updated encryption key and a one-generation-anterior encryption key as the above common keys, and setting unit respectively setting a one-generation-anterior encryption key for transmission, and a most-updated encryption key and a one-generation-anterior encryption key for receipt.
In a key receiving device performing encryption communications using a common key updated at a predetermined timing with a key transmitting device, a key receiving device comprising retaining unit retaining a most-updated encryption key and a one-generation-anterior encryption key as the above common keys, and setting unit respectively setting a most-updated encryption key for transmission, and a most-updated encryption key and a one-generation-anterior encryption key for receipt.
In a method of performing encryption communications using a common key updated at a predetermined timing between a key transmitting device and a key receiving device, a common key encryption communication method characterized in that the key transmitting device retains a most-updated encryption key and a one-generation-anterior encryption key as the above common keys, sets respectively the one-generation-anterior encryption key for transmission and for receipt, and the above key receiving device retains the most-updated encryption key and the one-generation-anterior encryption key as the above common keys, and sets respectively the most-updated encryption key for transmission and the most-updated encryption key and the one-generation-anterior encryption key for receipt.
Dependencies are inferred from the claim text.