We demonstrate relay attacks on Passive Keyless Entry and Start (PKES) systems used in modern cars. We build two efficient and inexpensive attack realizations, wired and wireless physical-layer relays, that allow the attacker to enter and start a car by relaying messages between the car and the smart key. Our relays are completely independent of the modulation, protocol, or presence of strong a...

This research study and analyse the various attacks RFID card on Mifare's disadvantage and safety concerns crux of the problem. The key recovery attack method depends on a plaintext-ciphertext pair on the existing relationship, as well as the secret parameters of the pseudo random number for use of the timing inappropriate. We proposed a scheme to improve the mechanisms for authentication, no a...

1 We describe a side-channel attack on a substitution block, which is usually implemented as a table lookup operation. In particular, we have investigated smartcard implementations. The attack is based on the identifying equal intermediate results from power measurements while the actual values of these intermediates remain unknown. A powerful attack on substitution blocks can be mounted if the...

We present an Identity Based Encryption (IBE) system that is fully secure in the standard model and has several advantages over previous such systems – namely, computational efficiency, shorter public parameters, and a “tight” security reduction, albeit to a stronger assumption that depends on the number of private key generation queries made by the adversary. Our assumption is a variant of Bon...

Password-based key-server protocols are susceptible to password chaining attacks, in which an enemy uses knowledge of a user's current password to learn all future passwords. As a result, the exposure of a single password eeectively compromises all future communications by that user. The same protocols also tend to be vulnerable to dictionary attacks against user passwords. Bellovin and Merritt...

The Megamos Crypto transponder is used in one of the most widely deployed electronic vehicle immobilizers. It is used among others in most Audi, Fiat, Honda, Volkswagen and Volvo cars. Such an immobilizer is an antitheft device which prevents the engine of the vehicle from starting when the corresponding transponder is not present. This transponder is a passive RFID tag which is embedded in the...

Networks becomes more complex practically in terms of offered services such as electronic commerce. As a result, networks are more and more subject to various kinds of complex security attacks. Existing security system responses have reached their limits in detecting and defending against various network attacks because current attacks are decentralized, automated and intelligent and these syst...

In this article, we provide the first third-party security analysis of the PRINCE lightweight block cipher, and the underlying PRINCEcore. First, while no claim was made by the authors regarding related-key attacks, we show that one can attack the full cipher with only a single pair of related keys, and then reuse the same idea to derive an attack in the single-key model for the full PRINCEcore...

Cryptompress, a new 128-bit (initial) private-key cryptography algorithm is proposed. It uses a block size of at least 30 bits and increments prior key size to additional 32 bits on each unsuccessful attempt of any means, including bruteforcing, further changing a specific portion of the cyphertext using the reformed Feistel network. Encryption process results from a proposed compression sequen...