IEEE Consumer Electronics Magazine - September/October 2021 - 87

Figure 4. Overall process in the proposed framework.
Therefore, anadversaryAcan tamper the communicated
information from the public channel. The
Dolev-Yao (DY) threat model10 helps an adversaryAnot
only to eavesdrop the transmittedmessages,
but also to interrupt the messages by
modifying, deleting, or injecting fake messages in
the communication channel. As a result, A can
launch other potential attacks, such as man-inthe-middle
attack, replay attack, node impersonation
attack, and privileged-insider attack. Apart
from the DY model, A can also utilize the broadly
recognized current de facto CK-adversary threat
model,7 which is more powerful than the DY
threat model. The CK-adversary threat model
allows the adversary A notonlytotamperwith
the data as per the DY threat model, but also can
compromise the session states, session secret credentials,
and private keys using session-hijacking
attacks. Due to the hostile environment in IoE
application, A can physically capture some IoT
smart devices, and through the power analysis
attack,11 A can fetch all the stored secret credentials
from their memory. Thus, it gets exposed to a
potential active attack, known as ESL attack, and
physical device or node capture attack. To avoid
such attacks, generation of secret (session) keys
among the entities for an access control framework
should incorporate the combination of
both the session-specific (ephemeral) credentials
September/October 2021
(known as short-term secrets) and the long-term
secrets (master secret keys). In addition, we also
assume that A may attempt to corrupt the data
sets stored in servers through data-poisoning
attacks that may lead to incorrect predictions
while the AI-based big data analytics are performed
on the corrupted data sets.
AI-ENVISIONED BLOCKCHAINENABLED
ACCESS CONTROL
FRAMEWORK
In this section, we discuss a generalized
blockchain-envisioned access control framework
for detecting and mitigating various malicious
attacks discussed in " Attack Trends in IOE Environment "
section for securing an IoE environment.
The overall process involved in the
proposed framework is explained in Figure 4. In
the following, we discuss various phases associated
with the proposed framework.
Registration Phase
A trusted registration authority ðRAÞ will
enroll/register all smart devices prior to their
deployment in the IoE environment by preloading
the necessary secret credentials in their
memory (see Steps 3 and 4 in Figure 4). A user
can also register him/herself to the RA by
87

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