IEEE Consumer Electronics Magazine - July 2018 - 68
ID of user A and his or her information are not exposed
during the process. The process is as follows:
- User A transmits the message M, which is a consent
form for personal data collection, to Node A. The message is encrypted using the common secret key, which is
In this study, we used the publickey cryptography technique to
accomplish the aforementioned
security needs.
ID
- Upon receiving the cipher text, user A deciphers it using
his or her own private key and the public key obtained
from node A's certificate. It also determines whether the
real identification (ID) of node A matches the certificate; if it does, then authentication was successful for
both parties.
2) Privacy protection: To prevent the locations of user A and
node A from being exposed while engaging in message
transmission, they will arrange for anonymous IDs and
common secret keys for the confidentiality of their messages. The process is as follows:
- User A sends its anonymous ID and common secret key
to node A that can be regarded as
PU ID t,n ^PR ID t,u ^ID P, u || SK ID P,u ) ID t,n h || C ID t, u ah .
a
a
a
a
a
SK ID P,u ) ID t,n (ID t,n || CID t,n ) .
a
a
a
a
(4)
- User A receives the ciphertext, deciphers it using the
common secret key, and confirms the success of the
registration.
3) Medical information collection: When node A wishes to
collect information from user A, it must first obtain the
consent form of user A and then perform identity authentication with each of the nodes while ensuring that the
|| SK ID
P,u a
) ID t,n (M) .
(5)
a
- Node A receives the ciphertext and deciphers it using
the common secret key. It thus obtains the consent form.
- Node A conducts the identity authentication with each node.
- Node A uses the public keys of other nodes and the private key of node A to encrypt the message and then sends
the message to the other nodes. This can be regarded as
PU ID (PR ID (M) || C ID ) .
t, 6 n
t,n a
t,n a
PU ID (PR ID (M || ID t,ua || C ID ) .
t,n a
t, 6 n
t, 6 n
Notation
Description
Notation
Description
ni
The i th node
et
The bilinear map
uj
The j th user
P
The generator of G1
ID t, u
The real ID of the user u
H1
H 1: " 0, 1 ,* " G 1
ID P, u
The anonymous ID of the user u
H
The hash function
G1
The additive group
M
The message or smart contract
G2
The multiplicative group
SK
The common secret key
s
A random number s ! Z *q chosen as the master key,
where Z *q is a finite field of order q
PU IDu = H 1 ^ID u # P h
The public key of user u
C IDu
A public-key certificate of ID u
PR IDu = H 1 ^ID u # s # P h
The private key of user u
^
july 2018
(7)
- Node A deciphers each node's ciphertext as it receives
them. Node A encrypts the medical information of user
A with the public key to prevent data exposure.
During the process, the information of user A is never
exposed on the network, ensuring user A's privacy protection.
Additionally, this also satisfies the requirements of the general data protection regulation.
In this study, we used the public-key cryptography technique to accomplish the aforementioned security needs.
When it comes to privacy in the message transmission process, other users cannot access the current location information of user A or any other sensitive information.
Table 1. Notations.
68 IEEE Consumer Electronics Magazine
(6)
- The other nodes receive the ciphertext and decipher it
while preventing the information of user A from being
exposed so that other users cannot track it. When the other
nodes search and find the information of user A, they
encrypt the message and transmit it to the other nodes as
(3)
- Node A encrypts the message using the common secret
key and sends the ciphertext to user A, which is
P,u a
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