The design and verification of cryptographic protocols is a notoriously difficulttask, even in symbolic models which take an abstract view of cryptography. This is mainlydue to the fact that protocols may interact with an arbitrary attacker which yields averification problem that has several sources of unboundedness (size of messages, numberof sessions, etc.).In this paper, ...

We present a graphical approach to security protocol representation. Protocol runs can be viewed as Message Sequence Charts. Message Sequence Charts are an appropriate graphical representation of security protocols. We show how sequence charts can be constructed from protocol runs of a broad range of processes in the Security Protocol Language (SPL). In their graphical form, Message Sequence Ch...

Security protocols are used pervasively to protect distributed communications in the third Millennium. This motivates the need for a definition of Information Assurance for security protocols, which, to the best of our knowledge, is still missing. Such a definition is advanced in terms of the requirements that security protocols be analysed at the same time realistically, accurately and formall...

Abstract— Bot networks are a serious threat to cyber security, whose destructive behavior affects network performance directly. Detecting of infected HTTP communications is a big challenge because infected HTTP connections are clearly merged with other types of HTTP traffic. Cybercriminals prefer to use the web as a communication environment to launch application layer attacks and secretly enga...

1 Preliminary versions of this paper appeared in [1, 2]. Summary It is preferable for authentication and key exchange protocols to be verified automatically and rapidly in accordance with security requirements. In order to meet these requirements, we proposed the security verification method (OKT method) for the aforementioned protocols based on Bellare et al.'s model (BPR model) and showed the...

Decentralised workflow management systems are a new research area, where most work to-date has focused on the system’s overall architecture. As little attention has been given to the security aspects in such systems, we follow a security driven approach, and consider, from the perspective of available security building blocks, how security can be implemented and what new opportunities are prese...

Modeling security for protocols running in the complex network environment of the Internet can be a daunting task. Ideally, a security model for the Internet should provide the following guarantee: a protocol that “securely” implements a particular task specification will retain all the same security properties as the specification itself, even when an arbitrary set of protocols runs concurrent...

The notion of simulatable security (reactive simulatability, universal composability) is a powerful tool for allowing the modular design of cryptographic protocols (composition of protocols) and showing the security of a given protocol embedded in a larger one. Recently, these methods have received much attention in the quantum cryptographic community (e.g. [RK04,BOHL04]). We give a short intro...

Security protocols play an important role in modern communications. However, security protocol development is a delicate task, and experience shows that computer security protocols are notoriously difficult to get right. Recently, Clark and Jacob provided a framework for automatic protocol generation based on combinatorial optimization techniques and the symmetric key part of BAN logic. This pa...