Candidate:
Aiden
Feng
Title:
A
Design
of
Electronic
MedicalRecord
System
based
on
Permissioned
Blockchain
Date:
January
24,
2022
Time:
13:30
Place:
online
Supervisor(s):
Gong,
Guang
Abstract:
Blockchain,
due
to
its
decentralized,
verifiable,
and
security
features,
is
increasingly
used
in
more
and
more
scenarios,
but
the
original
public
chain
cannot
meet
the
needs
of
some
enterprise
or
group
financial
scenarios
or
medical
scenarios,
and
these
more
segmented
special
application
scenarios
have
added
many
requirements
for
security,
identity
and
role
definition
to
the
blockchain
system,
so
people
have
launched
a
lot
of
research
on
permissioned
blockchain.
However,
the
Practical
Byzantine
Fault-Tolerant
(PBFT)
based
permissioned
chain
is
no
longer
able
to
meet
the
increasing
demand
of
nodes
in
today's
healthcare
system
due
to
the
shortcomings
such
as
high
communication
volume
and
poor
scalability.
In
this
thesis,
we
will
explore
the
application
of
permissioned
blockchain
in
the
medical
scenario,
and
try
to
optimize
the
communication
volume
of
PBFT
by
cascading
network,
optimize
its
communication
complexity
from
O(n2)
to
O(n),
and
add
a
credit
mechanism
to
reduce
the
probability
of
key
nodes
becoming
Byzantine
nodes.
We
also
add
a
series
of
scalability
mechanisms
and
new
node
verification
addition
and
removal
mechanisms
to
compensate
for
the
disadvantage
of
the
non-dynamic
number
of
nodes
in
the
original
PBFT.