Method and system for managing shared information
First Claim
1. A method for managing shared information which is generated between first and second communication devices in a communication system, comprising:
- generating the shared information at each of the first and second communication devices;
transmitting identifying information from the first communication device to the second communication device, wherein the identifying information identifies a piece of the shared information generated in the first communication device;
making an association between same pieces of the shared information generated at respective ones of the first and second communication devices based on the identifying information; and
storing associated pieces of the shared information at respective ones of the first and second communication devices.
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Accused Products
Abstract
A method and system for allowing communication devices to synchronously manage shared information are provided. A sender sends single-photon pulses modulated with original random numbers to a receiver and also sends frame pulses by using ordinary optical pulses. Bit comparison and basis reconciliation are performed by the frame which is defined by the frame pulses, whereby sifted keys, which are aggregated as a file, are generated by the sender and the receiver individually. The sifted keys are subjected to error correction, privacy amplification, and file sharing processing by the file, whereby common cryptographic keys are synchronously stored in the sender and the receiver individually. The generated cryptographic keys are managed as encryption keys and decryption keys separately. A newly generated key is preferentially placed in the encryption keys or decryption keys that have a smaller stored amount.
78 Citations
24 Claims
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1. A method for managing shared information which is generated between first and second communication devices in a communication system, comprising:
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generating the shared information at each of the first and second communication devices; transmitting identifying information from the first communication device to the second communication device, wherein the identifying information identifies a piece of the shared information generated in the first communication device; making an association between same pieces of the shared information generated at respective ones of the first and second communication devices based on the identifying information; and storing associated pieces of the shared information at respective ones of the first and second communication devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for managing shared information which is shared between communication devices in a communication system, wherein each of the communication devices comprises:
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a shared information generator for generating the shared information; a memory for storing the shared information; a manager for communicating identifying information with another communication device to make an association with same piece of the shared information generated in the other communication device, wherein the identifying information identifies said piece of the shared information; and a storage section for storing associated pieces of the shared information. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A communication device for managing shared information which is shared with another communication device, comprising:
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a shared information generator for generating the shared information; a memory for storing the shared information; a manager for communicating identifying information with another communication device to make an association with same piece of the shared information generated in the other communication device, wherein the identifying information identifies said piece of the shared information; and a storage section for storing associated pieces of the shared information.
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23. A program for instructing a computer to manage shared information which is shared with another communication device, comprising:
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storing the shared information in a memory; communicating identifying information with another communication device through a communication section to make an association with same piece of the shared information generated in the other communication device, wherein the identifying information identifies said piece of the shared information; and storing associated pieces of the shared information in a storage section.
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24. A communication system for secret communication between first and second communication devices, wherein
the first communication device comprises: -
a first generator for generating secret information to be shared with the second communication device; a first memory for storing the secret information; a first manager for transmitting identifying information to the second communication device to make an association with same piece of the secret information generated in the second communication device, wherein the identifying information identifies said piece of the secret information; and a first storage section for storing associated pieces of the secret information, and the second communication device comprises; a second generator for generating the secret information to be shared with the second communication device; a second memory for storing the secret information; a second manager for using the identifying information received from the first communication device to make an association with the same piece of the secret information generated in the first communication device; and a second storage section for storing associated pieces of the secret information.
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Specification