A Rhythm-Based Authentication Scheme for Smart Media Devices

Table 3

Matching table for generation of union key.

Key combination	Union note
Non	0
A	1
B	2
C	3
D	4
A + B	5
A + C	6
A + D	7
B + C	8
B + D	9
C + D	a
A + B + C	b
A + B + D	c
A + C + D	d
B + C + D	e
A + B + C + D	f