No abstract

No abstract

In connected cars with various electronic control unit (ECU) modules, Ethernet is used to communicate data received by the sensor in real time, but it is partially used alongside a controller area network (CAN) due to the cost. There are security threats in the CAN, such as replay attacks and denial-of-service attacks, which can disrupt the driver or cause serious damage, such as a car accident through malicious manipulation. Although several secure protocols for protecting CAN messages have been proposed, they carry limitations, such as combining additional elements for security or modifying CAN messages with a limited length. Therefore, in this paper, we propose a method for encrypting the data frame, including real data in the CAN message structure, using format-preserving encryption (FPE), which ensures that the plaintext and ciphertext have the same format and length. In this way, block ciphers such as AES-128 must be divided into two or three blocks, but FPE can be processed simultaneously by encrypting them according to the CAN message format, thus providing better security against denial-of-service attacks. Based on the 150 ms CAN message, a normal message was received from a malicious message injection of 180 ms or more for AES-128 and a malicious message injection of 100 ms or more for FPE. Finally, based on the proposed scheme, a CAN transmission environment is constructed for analyzing the encryption/decryption rate and the process of transmitting and processing the encrypted message for connected cars in multi-access edge computing (MEC). This scheme is compared with other algorithms to verify that it can be used in a real environment.

No abstract

The secure USB flash drive was developed to improve the security of the conventional USB flash drive, which is vulnerable to leakages of internally stored data caused by extortion, loss, etc. However, it has been continuously reported that the secure USB flash drive, which protects data through the adoption of a wide range of security technologies in wide-ranging ways, cannot assure data security because of implementation and environmental vulnerabilities, eavesdropping, unlock commands, and reverse engineering. As such, there is growing demand for a more powerful secure USB flash drive to solve these fundamental problems. Therefore, this paper presents a secure USB mechanism that prevents leakages of authentication data and does not compare authentication data for smart human care services, which have been a fundamental problem of existing flash drives. The proposed mechanism provides better security than the existing secure USB flash drive by satisfying the need for confidentiality, integrity, authentication, and access control and safely protecting data from impersonation, man-in-the-middle, replay, and eavesdropping attacks by malicious attackers. An assessment of its security using the formalized verification tool AVISPA has proved that it is safe. Therefore, it is considered that a safer, more secure USB flash drive can be manufactured using the mechanism proposed in this paper.