Patent ID: 11870904
Assignee: NANHU LABORATORY
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 15:
16. The method according to claim 1, wherein, when a data subset (Data2_i) in the data (Data_i) needs to be stored permanently, the method further comprises:
S81) encrypting and storing, by using the data key (Data_Key_i), the data subset (Data2_i) into a disk, and saving the data token (User_Data_Token_i);
S82) repeating S4-S7 in next use;
wherein, when the data provider is a secure USB flash disk, S2 and S3 are replaced by the following steps:
a PIN code (PIN_USB) for securely reading the data (Data_i) in the secure USB flash disk is divided into a first portion (PIN_BASE) of the PIN code (PIN_USB) and a second portion (ON_USER) of the PIN code (PIN_USB);
PIN_USB=Data_Key_i, PIN_BASE=User_Base_Key, PIN_USER=User_Data_Token_i;
in S4, when the secure USB flash disk is connected to the user host (Host_User), the second portion (PIN_USER) is transmitted to the user host (Host_User), and the user host (Host_User) obtains the first portion (PIN_BASE) and the PIN code (PIN_USB) in sequence through S5 and S6, and then uses the PIN code (PIN_USB) to securely read the data in the secure USB flash disk through S7.