Algorithm 2

Input: Additional data from Smartphone-based motion sensors

1.

Initialize h; Initial state of the hash function

2.

Encrypt h using E _k; by forwarding 128 bits of zeros to AES

3.

PT⊕ h →> PTh

4.

Repeat for all n ₊₁

5.

len(PT)+ h

6.

Return PTh

Output: Motion data authenticated