(Received: October 30, 2011; Accepted: December 8, 2011) Abstract: This paper presents a novel technique for transformer differential protection to prevent incorrect operation due to inrush current. The proposed method in this paper is based on time-frequency transform known as the Wavelet transform. The discrete Wavelet transform is used for analysis the differential current signals in time an...

The XOR-Encrypt-XOR (XEX) block cipher mode was introduced by Rogaway in 2004. XEX mode uses nonce-based secret masks (L) that are distinct for each message. The existence of secret masks in XEX mode prevents the application of conventional fault attack techniques, such as differential fault analysis. This work investigates other types of fault attacks against XEX mode that either eliminate the...

In this paper we show a new differential fault analysis (DFA) on the AES-128 key scheduling process. We can obtain 96 bits of the key with 2 pairs of correct and faulty ciphertexts enabling an easy exhaustive key search of 2 keys. Furthermore we can retrieve the entire 128 bits with 4 pairs. To the authors’ best knowledge, it is the smallest number of pairs to find the entire AES-128 key with a...

In the late nineties, Eli Biham and Adi Shamir published the first paper on Differential Fault Analysis on symmetric key algorithms. More specifically they introduced a fault model where a key bit located in non-volatile memory is forced to 0/1 with a fault injection. In their scenario the fault was permanent, and could lead the attacker to full key recovery with low complexity. In this paper, ...

Security and attacks are two sides of the same coin in the smart card industry. Smart cards are prone to different types of attacks to gain access to the assets stored in it and that can cause security issues. It is necessary to identify and exploit these attacks and implement appropriate countermeasures to mitigate their effects. Fault attacks are one among them. They can introduce abnormal be...

Differential Fault Intensity Analysis (DFIA) is a recently introduced fault analysis technique. This technique is based on the observation that faults are biased and thus are non-uniformly distributed over the cipher state variables. The adversary uses the fault bias as a source of leakage by controlling the intensity of fault injection. DFIA exploits statistical analysis to correlate the secre...

Malware for smartphones has rocketed over the last years. Market operators face the challenge of keeping their stores free from malicious apps, a task that has become increasingly complex as malware developers are progressively using advanced techniques to defeat malware detection tools. One such technique commonly observed in recent malware samples consists of hiding and obfuscating modules co...

The goal of a fault injection attack is to extract a secret key which is embedded in a cryptographic device by injecting a fault during execution of the algorithm. In particular, an attacker can extract the master key of the advanced encryption standard (AES) using only a one-byte fault injection. We propose a new countermeasure method resistant to fault injection attacks by checking the differ...