8/7/2019 AES-128 Security Protocol for Automobile Remote Keyless
System
1/2
CHIPCraft The CAREER Engineering
AES-128 Security Protocol for Automobile Remote Keyless
System
ABSTRACT
The AES algorithm is a symmetric block cipher. Block cipher
requires different
key to each different block. The data block size is fixed to be
128bits, while key length
can be 128, 192 or 256 bits. The AES is a round-based algorithm
.The number of rounds
are 10, 12, or 14, when the key length is128, 192 or 256 bits
respectively. Each round of
AES algorithm performs the three transformations addroundkey,
sub bytes and shift
rows, except the final round, each round also performs mix
columns.
The remote keyless system is widely used in automobile industry
to lock or
unlock the automobile's door, trunk, and start the ignition. It
comprises a handheld key
fob to be held by the driver and a set of radio transceiver
devices located in the
automobile. Operation commands are represented by strings of
wireless si
transmitted between the key fob and the radio transceiver to
realize various car
operations. Because the radio signal is transmitted in proximity
of open area, the remote
keyless system has the possibility of exposing the key secret
commands to a car thief.
The operation commands, which are denoted by plaintexts or even
cipher texts, cannot
overcome this security problem. This paper proposes a new
approach in which encryption
of the operation commands is realized by a model ofAESalgorithm
computed with a
fixed key and a variable key. In the newly designed AES security
protocol, the key fob
and radio device will be engaged in the protocol interrogation
after the key fob initiates a
connection. The fixed key can be defined by car manufacturer or
car dealer, and it is used
for the encryption of handshake message and a pseudo random
number (PRN). This PRN
is proposed by the key fob, and will serve as the variable
key.
Advantages of AES include, its a block cipher so plenty of data
can be
transmitted with different keys. Due to its complexity it is
difficult to break the key.
Computation speed of different operations will be more. The
hardware implementations
reduce the encryption/decryption of data. The software
implementation reduces the cost.
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