Method for synchronizing file

Patent metadata

Field	Value
Publication number	US-2016110377-A1
Application number	US-201414588119-A
Country	US
Kind code	A1
Filing date	Dec 31, 2014
Priority date	Oct 21, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

Provided is a method of file synchronizing. The method includes: determining whether there is a changed matter in a file which is divided into a plurality of chunk files; calculating a hash value for each of plurality of divided chunk files when it is determined that there is a changed matter in file; transmitting a hash value list configured by calculated hash values to a server; receiving a transmission request for a chunk file corresponding to a hash value which is not stored in server, among hash values included in hash value list; and transmitting chunk file to the server in response to the transmission request.

First claim

What is claimed is:

1 . A file synchronizing method of a terminal device, the method comprising:
determining whether changed matter exists in a file which is divided into a plurality of chunk files; calculating a hash value for each of the plurality of divided chunk files when it is determined that the changed matter exists in the file; transmitting a hash value list that includes the calculated hash values to a server; receiving a transmission request for a chunk file corresponding to a hash value which is not stored in the server, among the hash values included in the hash value list; and transmitting the chunk file to the server in response to the transmission request.

2 . The method of claim 1 , wherein the transmitting of the chunk file comprises encrypting the chunk file with an authentication key received from the server in response to a user authentication request.

3 . The method of claim 1 , wherein the changed matter comprises a new chunk file that is included in the file or at least one of the plurality of chunk files which is modified.

4 . A file synchronizing method of a server, the method comprising:
receiving hash values for a plurality of chunk files which have been stored in a terminal device; comparing hash values in a hash table that has been previously stored on the server with the received hash values; transmitting a transmission request signal for a chunk file corresponding to a hash value which is not included in the previously stored hash table to the terminal device; and receiving the chunk file, in response to the transmission request signal.

5 . The method of claim 4 , further comprising:
receiving a user authentication request from the terminal device; and generating a hash table, a file table, and a metadata table corresponding to user authentication information included in the user authentication request, wherein the file table includes information for generating a file using the chunk files and the metadata table includes metadata information of the file.

6 . The method of claim 5 , further comprising:
updating the hash table, the file table, and the meta table in response to receiving the chunk file.

7 . A file synchronizing method of a terminal device, the method comprising:
receiving a metadata table including metadata information for a plurality files which have been stored in a server; comparing the received metadata table with metadata of a file which has been stored in the terminal device to detect a file having changed matter; requesting the server to transmit a chunk file of the file having the changed matter; and receiving the chunk file of the file having the changed matter from the server.

8 . The method of claim 7 , further comprising:
updating metadata of the file having the changed matter in response to receiving the chunk file.

9 . The method of claim 7 , wherein the receiving the metadata table further comprises:
transmitting user authentication information to the server; and receiving the metadata table which corresponds to the user authentication information in response to a successful user authentication process using the user authentication information.

10 . The method of claim 7 , wherein the receiving the chunk file further comprises:
receiving a file table from the server; and generating, using the file table, a file using chunk files of the file having the changed matter and the plurality of chunk files which have been stored in the terminal device.

11 . The method of claim 7 , wherein the requesting the server comprises:
receiving hash values for a plurality of chunk files which have been stored in the server; comparing a hash table which has been stored in the terminal device with the received hash values; and transmitting a transmission request signal for a chunk file corresponding to a hash value which is not included in the hash table, to the server.

12 . A file synchronizing method of a server, the method comprising:
calculating hash values for a plurality of chunk files which have been stored in the server; transmitting a hash value list comprising the calculated hash values to a terminal device; receiving a transmission request for a chunk file corresponding to a hash value which is not stored in the terminal device but which is included in the hash value list; and transmitting the chunk file to the terminal device in response to the transmission request.

13 . The method of claim 12 , wherein the transmitting the chunk file comprises:
generating an authentication key with user authentication information included in a user authentication request; and encrypting the chunk file with the generated authentication key.

14 . A computer program which is coupled with a computer device to execute a process, the process comprising:
determining whether changed matter exists in a file which is divided into a plurality of chunk files; calculating a hash value for each of the plurality of divided chunk files when it is determined that the changed matter exists in the file; transmitting a hash value list that includes the calculated hash values to a server; receiving a transmission request for a chunk file corresponding to a hash value which is not stored in the server, among the hash values included in the hash value list; and transmitting the chunk file to the server in response to the transmission request.

15 . A computer program which is coupled with a computer device to execute a process, the process comprising:
receiving hash values for a plurality of chunk files which have been stored in a terminal device; comparing hash values in a hash table that has been previously stored on the server with the received hash values; transmitting a transmission request signal for a chunk file corresponding to a hash value which is not included in the previously stored hash table to the terminal device; and receiving the chunk file, in response to the transmission request signal.

16 . The method of claim 1 , wherein whether the changed matter exists is determined based on metadata of the file.

17 . The method of claim 1 , wherein the chunk file is transmitted to the server in response to the transmission request in order to synchronize the file.

Assignees

• Samsung Sds Co Ltd

Inventors

• Yun Ju Seok
• Kim Yong Tae
• Kim Hyeong Goo

Classifications

• G06F17/30097

  Physics · mapped topic

• H04L63/0428

  wherein the data content is protected, e.g. by encrypting or encapsulating the payload · CPC title

• G06F21/602

  Providing cryptographic facilities or services · CPC title

• G06F21/6209

  to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself · CPC title

• G06F17/30174 Primary

  Physics · mapped topic