Methods and devices for maintaining a domain
The invention proposes methods and devices for managing domains. The domains comprise a plurality of member devices, and the method comprises the steps of: storing (S 500 , S 501 ), by a first domain manager (M 1 ), domain management information (P 1 , P 2 , P 3 , P 4 and P 5 ) in said plurality of member devices; and obtaining (S 510 , S 511 ), by a second domain manager (M 2 ), said domain management information from at least one of said plurality of member devices. In comparison with the prior art, where the domain management information is maintained in the domain authority, the embodiment decreases the work load of the domain authority and provides conveniences.
1. A method of managing a domain comprising a plurality of member devices, the method comprising the steps of:
storing, by a first unit, domain management information into the plurality of member devices, comprising:
generating, by a first subunit a plurality of pieces of data from at least part of a domain management information, wherein each of the plurality of pieces of data is different; and
distributing, by a second sub-unit, individual ones of the plurality of pieces of data to corresponding ones of the plurality of member devices;
obtaining, by a second domain manager, the domain management information from at least one of the plurality of member devices, comprising:
receiving at least two pieces of data from a corresponding number of the plurality of member devices;
determining whether a number of different pieces of the received at least two pieces of data have been received, wherein the number of different pieces is determined based on the generating of the plurality of pieces of data; and
recovering the at least part of the domain management information from the determined number of different pieces of received data when the determined number of different pieces of received data exceeds a threshold value.
2. The method according to claim 1 , the generating step comprising:
constructing a polynomial, wherein the at least part of the domain management information is configured to be a coefficient of a term of the polynomial; and
generating the plurality of pieces of data using the constructed polynomial; and
the recovering step comprising:
calculating the coefficients according to the received pieces of data, wherein the number of different pieces of data is comparable to a number of terms of the polynomial.
3. The method according to claim 1 , the generating step comprising:
splitting the at least part of the domain management information into the plurality of pieces of data; and
the receiving step
receiving all of the plurality of pieces of data; and
combining the received pieces of data into the at least part of the domain management information.
4. The method according to claim 1 , further comprising:
authenticating, by a domain authority of the domain, the second domain manager;
authenticating, by the at least one of the plurality of member devices, the second domain manager.
5. A device for managing a domain, the domain comprising a plurality of member devices, wherein the device comprises:
a first unit for storing domain management information in the plurality of member devices;
wherein the first unit comprises:
a first subunit for generating a plurality of pieces of data from at least part of the domain management information; wherein a number of different pieces is determined based on the generating of the plurality of pieces of data;
a second subunit for distributing the plurality of pieces of data to the plurality of member devices, respectively.
6. A device for managing a domain, the domain comprising a plurality of member devices in which domain management information is stored in a plurality of pieces of data generated from at least part of the domain management information, such that at least two of the pieces of data which are different from each other are required for recovering the at least part of the domain management information and the plurality of data are distributed to the plurality of member devices respectively, wherein the device comprises:
a second unit for obtaining the domain management information from at least one of the plurality of member devices, the second unit ( 400 ) comprises:
a third subunit for:
receiving at least two pieces of data which are different from each other from at least two of the plurality of member devices; and
determining whether a number of different pieces of the received at least two pieces of data have been received, wherein the number of different pieces is determined based on the generating of the plurality of pieces of data; and
a fourth subunit for retrieving the at least part of the domain management information from the received at least two pieces of data.