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

Algorithm 1

Authentication process of the server.

Input: the current secret key (128 bit), the previous secret key (128 bit), tag’s response (160 bit)

Output: random number (64 bit), server’s response (160 bit)

()    Generate .

()    Send to the tag.

()    Wait until arrives to the server.

()    Parse as     .

()    Compute .

()    Compute .

()    if    then

()     Compute .

()    else if    then

()  Compute .

() else

()  Compute = random number.

() end if

() Send to the tag.

() if    then

()  Compute .

() end if