A Study on a Secure USB Mechanism That Prevents the Exposure of Authentication Information for Smart Human Care Services

Table 6

Terms.

Term		Description
Status information	U	User
	ID	ID (identifier)
	ID’	ID rereceived by a user for disk decryption
	PW	Password
	PW’	PW rereceived by a user for disk decryption
	DIF	Disk image file
	ENDIF	Encrypted disk image file
	DEDIF	Decrypted DIF
Operating status	F	Format
	RUR	Request user registration
	RAI	Request authentication information
	TAI	Transfer authentication information
	IU	Identify user
	RGDIF	Request generation of DIF
	TDI	Transfer disk information
	GDIF	Generate DIF
	IID	Insert ID in an empty space in the file system header
	AU	Authenticate user
	FR	Finish registration
	MD	Mount disk
	SDIF	Select DIF
Encryption/decryption	h()	Hash operation
	H	h(PW), result of hash operation based on PW
	H’	h(PW’), result of hash operation based on PW’
	C = EK(P)	Result C of encryption of the plain text P based on the key K
	P = DK(C)	Result P of decryption of the cyphered data C based on the key K
	EDIF	Encrypt DIF
	RDDIF	Request decryption of DIF
	RDFSH	Request decryption of file system header
	DFSH	Decrypt file system header
	DDIF	Decrypt DIF
Entity	User	User authentication
	Management program	Management program
	USB flash drive	USB flash drive