Fully Integrated Passive UHF RFID Tag for Hash-Based Mutual Authentication Protocol

Algorithm 2

Authentication process of the tag.

Input: the current secret key (128 bit), random number (64 bit), server’s response (160 bit)

Output: tag’s response (160 bit)

() Wait until arrives to the tag.

() Generate .

() Compute .

() Generate =     .

() Send to the server.

() Wait until arrives to the tag.

() Compute .

() if    then

()  Compute .

() end if