The purpose of this paper is to propose a design technique for improving the resistance of the Quasi Delay Insensitive (QDI) Asynchronous logic against Differential Power Analysis Attacks. This countermeasure exploits the properties of the QDI circuit acknowledgement signals to introduce temporal variations so as to randomly desynchronize the data processing times. The efficiency of the counter...

Power analysis attacks are a serious treat for implementations of modern cryptographic algorithms. Masking is a particularly appealing countermeasure against such attacks since it increases the security to a well quantifiable level and can be implemented without modifying the underlying technology. Its main drawback is the performance overhead it implies. For example, due to prohibitive memory ...

The monitoring of properties of complex software systems can provide the core functionality for detecting violations of such properties. However, the violations detection cannot be always sufficient for the preservation of the properties. Except for the detection, the explanations of the occurrence of a violation could play significant role for the preservation task. In particular, diagnosis ca...

This paper proposes new chosen-message power-analysis attacks against public-key cryptosystems based on modular exponentiation, which use specific input pairs to generate collisions between squaring operations at different locations in the two power traces. Unlike previous attacks of this kind, the new attacks can be applied to all the standard implementations of the exponentiation process: bin...

In this modern era where technology plays an important role, persons can be recognized (for security reasons) depending upon their behavioral and physiological characteristics (for example fingerprint, face, iris, keystroke,signature, voice, etc.) such systems are known as biometric systems . In these kind of systems the security is still a question mark because of various intruders and attacks...

A Hardware Trojan is a malicious, undesired, intentional modification of an electronic circuit or design, resulting in the incorrect behaviour of an electronic device when in operation – a back-door that can be inserted into hardware. A Hardware Trojan may be able to defeat any and all security mechanisms (software or hardware-based) and subvert or augment the normal operation of an infected de...

Reducing the entropy of the mask is a technique which has been proposed to mitigate the high performance overhead of masked software implementations of symmetric block ciphers. Rotating S-box Masking (RSM) is an example of such schemes applied to AES with the purpose of maintaining the security at least against univariate first-order side-channel attacks. This article examines the vulnerability...

Ambient Intelligence (AmI) requires devices everywhere, dynamic and massively distributed networks of low-cost nodes that, among other data, manage private information or control restricted operations. MSP430, a 16-bit microcontroller, is used in WSN platforms, as the TelosB. Physical access to devices cannot be restricted, so attackers consider them a target of their malicious attacks in order...

Changing source code is not an easy task. Developers occasionally change source code incorrectly or overlook code fragments that need to be changed. Such mistakes entail additional cost in having to reedit the source code correctly, and repeated changes themselves can be a hazard to software quality. We are conducting research into realizing automated code changing as a countermeasure for human...

Peer-to-Peer (P2P) Networks continue to be popular means of trading content. However the files exchanged in these networks are not malicious, making them an ideal medium for spreading Malware. Some existing studies have shown that Malware proliferation can pose significant threats to P2P Networks, defending against such an attack are largely an open problem. This paper aims to develop the count...