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Vehicular ad hoc networks (VANETs) adopt the Expedite Message Authentication Protocol (EMAP) and Certificate Revocation Lists (CRLs) for their security. In any EMAP system, the authentication of a received message is performed by checking if the certificate of the sender is included in the current CRL, and verifying the authenticity of the certificate and signature of the sender. In this paper,...

Theft of stored credit card information is an increasing threat to e-commerce. We propose a dynamic virtual credit card number scheme that reduces the damage caused by stolen credit card numbers. A user can use an existing credit card account to generate multiple virtual credit card numbers that are either usable for a single transaction or are tied with a particular merchant. We call the schem...

In this paper, we show a very efficient side channel attack against HMAC. Our attack assumes the presence of a side channel that reveals the Hamming distance of some registers. After a profiling phase in which the adversary has access to a device and can configure it, the attack recovers the secret key by monitoring a single execution of HMAC-SHA-1. The secret key can be recovered using a "temp...

as a response to a growing interest in rfid systems such as internet of things technology along with satisfying the security of these networks, proposing secure authentication protocols are indispensable part of the system design. hence, authentication protocols to increase security and privacy in rfid applications have gained much attention in the literature. in this study, security and privac...

The wireless sensor can be considered as one of the most major technologies through using it in different application such environmental applications, military commercial health applications and agriculture applications. Due to networks may deployed open area (uncontrolled area), especially applica­tions. In situ­ations, nodes are vulnerable captured. Moreover, data/control packets inter­cepted...

The Hill cipher is resistant to brute-force and statistical attacks, but it can be broken with a known plaintext-ciphertext attack (KPCA). In this paper, we propose a modification of the Hill cipher, HCM-PRE, which is still resistant to brute-force and statistical attacks, and is resistant also to KPCA due to dynamic encryption key matrix generating. With the modification, the new HCM-PRE can b...