A recent trend in cryptography is to construct cryptosystems that are secure against physical attacks. Such attacks are usually divided into two classes: the leakage attacks in which the adversary obtains some information about the internal state of the machine, and the tampering attacks where the adversary can modify this state. One of the popular tools used to provide tamper-resistance are th...

We describe a broadcast encryption system with revocation, where security is based on PUF (Physical Unclonable Function) instead of a cryptographic problem. Our scheme is immune to advances of cryptography (which may suddenly ruin any system depending solely of cryptographic assumptions). It is resilient to collusion attacks, which are frequently the Achilles’ heel of schemes based on cryptogra...

This paper deals with a description of wireless sensor networks at the beginning. Further follows the introduction to the agent platform suitable for wireless networks. Mobile code and sensor networks suffer from considerable security problems. Our proposal of countermeasure is based on combination of smartcards with sensor nodes. Smartcards as a tamper resistant devices offer solution for the ...

An increasing number of systems, from pay-TV to electronic purses, rely on the tamper resistance of smartcards and other security processors. We describe a number of attacks on such systems — some old, some new and some that are simply little known outside the chip testing community. We conclude that trusting tamper resistance is problematic; smartcards are broken routinely, and even a device t...

An increasing number of systems, from pay-TV to electronic purses, rely on the tamper resistance of smartcards and other security processors. We describe a number of attacks on such systems | some old, some new and some that are simply little known outside the chip testing community. We conclude that trusting tamper resistance is problematic; smartcards are broken routinely, and even a device t...

Leakage resilience and black-box impossibility results in cryptography Ali Juma Doctor of Philosophy Graduate Department of Computer Science University of Toronto 2011 In this thesis, we present constructions of leakage-resilient cryptographic primitives, and we give black-box impossibility results for certain classes of constructions of pseudo-random

Two protocols for authentication based on symmetric key cryptography are described, where the verifier can be implemented in software completely, without the need for secure storage of any secret information. The protocols use a symmetric cipher in an asymmetric fashion: the verifier uses a verification key which is derived from a symmetric master key. Software only verification means that the ...

Mobile code systems provide a exible and powerful platform to build distributed applications in an Internet scale, but they rise strong requirements from the security point of view. Security issues include authentication of the di erent remote parties involved and protection of the execution environments from malicious agents. Nonetheless, the most di cult task is to protect roaming agents from...

Software security to protect mobile agent consists of lots of aspects like cryptography, access control and trust management, intrusion detection and tamper resistance, authentication and privacy, signature schemes, e-commerce, security analysis, mobile computing security etc. So, to design and develop security mechanisms for mobile agents against malicious hosts this paper identifies different...

VANETs have the potential to dramatically increase road safety by giving drivers more time to react adequately to dangerous situations. To prevent abuse of VANETs, a security infrastructure is needed that ensures security requirements like message integrity, confidentiality, and availability. After giving more details on the requirements we propose a security infrastructure that uses asymmetric...