IEEE Consumer Electronics Magazine - March 2018 - 113

for eight key i/ps), where only a
unique predetermined valid key se-
quence can actuate it.
▼▼ Nonmutable key gates: Muting is per-
formed by controlling inputs in the
path between any key bits where all
of the remaining keys cannot reach
(impact) a particular key during sensi-
tization to the output. In the proposed
approach, for sensitizing a particular
key to the o/p by controlling a single
input, the effect of seven remaining
keys have to be muted (prevented)
from impacting. Since the proposed
ILB encode eight key gates per data
output bit, it is infeasible to mute the
remaining keys to sensitize a specific
key by controlling one single input.

SECURITY INSERTIONS
FOR THE PROPOSED ILB
The security due to the insertion of the
proposed ILB is given by (1)

K S = 2 ^ ^b * m * f h,

(1)

where KS = the key space, b = key bits
per ILB, m = the number of ILBs per
functional unit, and f = the number of
functional unit in the datapath. For
example, in Figure 4, the gate-level
structure of finite impulse response fil-
ter (FIR) comprises one adder and one
multiplier (1A, 1M) as functional units
(FUs). The data path is created for
4-bit; thus, m = 4. Furthermore, each
output bit is secured with an 8-bit key,
making b = 8. Therefore, the security
due to ILB insertion is 2 ^ (8 * 4 * 2) =
1.8 e + 19.

I/P

K1
K2
K3
K4

K5
K6
K7
K8

PSO-DSE
The PSO-DSE framework is adapted
from [16], and it mainly comprises four
constituents: particle swarm initializa-
tion, cost evaluation, updating local
best and global best, and updating

O/P
FIGURE 3. The proposed ILB.

FIGURE 4. The locked IP of the FIR benchmark.

March 2018

^

IEEE Consumer Electronics Magazine

113



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