File acquisition method and device based on two-dimensional code and two-dimensional code generating method

A two-dimensional code generating method, wherein, comprising:

• step 1:
• making calculation for the encrypted file to obtain a first unique value;
• step 2:
• splitting the encrypted file to obtain the first part A1, the second part A2 to the nth part An of the encrypted file;
• storing the first part A1, the second part A2 to the (n−1)th part An−1 of the encrypted file into n−1 storage addresses S1, S2 to Sn−i on a server;
• and obtaining an encrypted file address;
• step 3:
• conducting encryption for the nth data segment In and the encrypted file address to obtain encrypted data;
• and the nth data segment In is the data segment for the storage address Sn−1 of the (n−1)th data segment and the encrypted file An, the Sn−1 is on the server and obtained after analysis.
• step 4:
• signing for the first unique value and the encrypted data to obtain signature data;
• step 5:
• encoding the first unique value, the encrypted data and the signature data to form a two-dimensional code.

A file acquisition device based on a two-dimensional code, wherein, comprising:

• scanning and analyzing unit for acquiring and analyzing the two-dimensional code to obtain encoding data;
• data processing unit for obtaining encrypted data, a first unique value and signature data according to the encoding data;
• data decrypting unit for verifying the signature data;
• if verification of the signature data is passed, decrypting the encrypted data to obtain an encrypted file address and an nth data segment In;
• analyzing the nth data segment In to obtain an nth part An of the encrypted file and a storage address Sn−1 of an (n−1)th data segment In−1 located on a server, wherein n is the number of data segments obtained after file splitting;
• acquiring the (n−i)th data segment In−i of the encrypted file according to the storage address Sn−i of the (n−i)th data segment In−i, and analyzing the (n−i)th data segment In−i to obtain the (n−i)th part An−i of the encrypted file and the storage address Sn−(i+1) of the n−(i+1)th data segment In−(i+1), i=1,2,3, . . . , n−2;
• acquiring the first data segment of the encrypted file according to the storage address S1 of the first data segment Ii, and analyzing the first data segment to obtain the first part A1 of the encrypted file;
• file downloading and combining unit for downloading the encrypted file according to the encrypted file address, and integrating the first part A1, the second part A2 to the nth part An of the encrypted file to obtain the encrypted file;
• file verifying unit for verifying the encrypted file.