Key update system, key management device, communication terminal, and key information construction method for multihop network
First Claim
1. A key update system for a multihop network system comprising a key management device that manages keys using a hierarchical structure, and a plurality of communication terminals that obtain the keys, wherein the key management device constructs key information having a hierarchical structure that accords with the structure of the multihop network, and manages the key information, the key management device determining respective encryption keys for encrypting the keys based on the key information, and the communication terminals obtaining the respective keys, wherein the key management device comprises:
- a key information management portion that constructs and manages the key information;
an encryption portion that encrypts the keys using the keys included in the key information; and
a transmission portion that transmits the encrypted keys encrypted by the encryption portion, and the communication terminals respectively comprising;
a receiving portion that receives the encrypted keys;
a key management portion that manages, among the keys included in the key information, the keys that need to be held and stored by any given one of the communication terminals; and
a decryption portion that decrypts the encrypted keys.
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Abstract
The invention provides a key update system for a multihop network system including an authentication management device that manages keys using a hierarchical structure. That device constructs key information having a hierarchical structure in accordance with the structure of the multihop network. In addition, that device determines respective encryption keys for encrypting the keys based on the key information, and the communication terminals obtain the respective keys. In this system, that device includes a key tree management portion that constructs and manages the key information; an encryption portion that encrypts the keys using the keys included in the key information; and a transmission portion that transmits the encrypted keys. Each communication terminal includes a receiving portion that receives the encrypted keys; a key management portion that manages the keys that need to be held and stored by the given communication terminal; and a decryption portion that decrypts the encrypted keys.
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Citations
17 Claims
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1. A key update system for a multihop network system comprising a key management device that manages keys using a hierarchical structure, and a plurality of communication terminals that obtain the keys, wherein the key management device constructs key information having a hierarchical structure that accords with the structure of the multihop network, and manages the key information, the key management device determining respective encryption keys for encrypting the keys based on the key information, and the communication terminals obtaining the respective keys, wherein
the key management device comprises: -
a key information management portion that constructs and manages the key information;
an encryption portion that encrypts the keys using the keys included in the key information; and
a transmission portion that transmits the encrypted keys encrypted by the encryption portion, and the communication terminals respectively comprising;
a receiving portion that receives the encrypted keys;
a key management portion that manages, among the keys included in the key information, the keys that need to be held and stored by any given one of the communication terminals; and
a decryption portion that decrypts the encrypted keys. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A key management device that manages key information that has a hierarchical structure that accords with the structure of a multihop network, the key management device comprising:
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a key information management portion that constructs and manages the key information;
an encryption portion that encrypts the keys using the keys included in the key information; and
a transmission portion that transmits the encrypted keys encrypted by the encryption portion. - View Dependent Claims (9, 10)
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11. A communication terminal that obtains encrypted keys that are encrypted using keys included in key information that has a hierarchical structure that accords with the structure of a multihop network, the communication terminal comprising:
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a receiving portion that receives the encrypted keys;
a key management portion that manages, among the keys included in the key information, the keys that need to be held and stored by the communication terminal; and
a decryption portion that decrypts the encrypted keys. - View Dependent Claims (12, 13, 14, 15)
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16. A key information construction method comprising:
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grouping, from among communication terminals in a multihop network that have terminal devices functioning as parents, those communication terminals that have the same terminal device functioning as a parent; and
constructing key information having a hierarchical structure. - View Dependent Claims (17)
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Specification
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- Resources
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Current AssigneeOKI Electric Industry Company Limited
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Original AssigneeOKI Electric Industry Company Limited
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InventorsYao, Taketsugu
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current380/30
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CPC Class CodesH04L 63/065 for group communications cr...H04L 9/0822 using key encryption keyH04L 9/083 involving central third par...H04L 9/0891 Revocation or update of sec...
