[Retracted] Renovated XTEA Encoder Architecture-Based Lightweight Mutual Authentication Protocol for RFID and Green Wireless Sensor Network Applications

Table 1

Nomenclature and symbols used in the proposed protocol.

Notions	Explanations
Req	Reader’s request to the tag
ID	Identity number of the RFID tag
IDS	The pseudonym of the ID
RT	Tag’s random number
RS	Reader’s random number
CPWDMT	MSB 32 bits of cover-coded password generated through the proposed XTEA on the tag side
CPWDLT	LSB 32 bits of cover-coded password generated through the proposed XTEA on the tag side
CPWDMR	MSB 32 bits of cover-coded password generated through the proposed XTEA on the reader side
CPWDLR	LSB 32 bits of cover-coded password generated through the proposed XTEA on the reader side
| |	Concatenation operation
&	AND operation
^	XOR operation
<<	Left rotation
CTRL	Control signal generated by the protocol governing control module
IRC	Intermediate result in the multiple round encryptions of cover-coded password
IRC5	Intermediate result of cover-coded password at the end of the 5^th round
IRC10	Intermediate result of cover-coded password at the end of the 10^th round