Key device, key cloud system, decryption method, and program
AssigneeNippon Telegraph and Telephone Corporation
InventorsTsunekazu SAITO, Go YAMAMOTO, Tetsutaro KOBAYASHI
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Abstract
Registered network-based identification corresponding to any of networks is stored in a key device 12. A terminal device 11 sends ciphertext and network-based identification to the key device 12, using a network. The key device 12 receives the sent ciphertext and network-based identification and outputs response information corresponding to a decrypted value of the ciphertext when the network-based identification corresponds to the registered network-based identification. The terminal device 11 obtains the decrypted value from the response information.
Claims14
A key device comprising:
- a registered-network storage which stores registered network-based identification corresponding to any of networks;
- an input unit to which ciphertext and network-based identification is input;
- a response unit which generates response information corresponding to a decrypted value of the ciphertext;
- and
- an output unit which outputs the response information when the network-based identification corresponds to the registered network-based identification.
A key cloud system comprising:
- a key device;
- and
- a terminal device;
- registered network-based identification corresponding to any of networks being stored in the key device;
- ciphertext output from the terminal device and network-based identification corresponding to a network to which the terminal device is connected being input to the key device;
- and
- the key device outputting response information corresponding to a decrypted value of the ciphertext when the network-based identification corresponds to the registered network-based identification.
A decryption method comprising the steps of:
- receiving ciphertext and network-based identification by an input unit;
- and
- outputting response information corresponding to a decrypted value of the ciphertext from an output unit when the network-based identification corresponds to registered network-based identification, in which the registered network-based identification corresponding to any of networks is stored in a registered-network storage.
Dependencies are inferred from the claim text.