This paper promotes a non-repudiation system for student evaluation in an e-learning environment based on web services, AJAX frameworks and PEAR packages in order to implement XML security standards, to provide improved user experience, asynchronous data exchange and message authentication for on-line test papers. The motivation of this research is the need to arbitrate on-line evaluation for b...

Vehicular communication networking can provide wellsuited traffic messages, emergency warning messages and infotainment dissemination, and improve driving condition for drivers. The authentication of these information is particularly important in VANET since the wrong traffic information may result in traffic accident and traffic jam. And VANET requires short verifying delay to response message...

Car-2-Car communication requires the use of pseudonymous public keys to ensure the vehicle’s privacy by making its messages unlinkable over a longer period. The Pseudonymous PKI (PPKI) for Ubiquitous Computing by K. Zeng [Ze06] offers peer-side pseudonym generation, non-repudiation and an efficient revocation mechanism that excludes the revoked peers from the group of authorized participants. I...

Many protocols running over the Internet are neither formalised, nor formally analysed. The amount of documentation for telecommunication protocols used in real-life applications is huge, while the available analysis methods and tools require precise and clear-cut protocol clauses. A manual formalisation of the Session Initiation Protocol (SIP) used in Voice over IP (VoIP) applications is not f...

In this paper we present a classification of network security techniques such as: secrecy, authentication, non-repudiation and integrity control. The secrecy techniques are two categories: cryptography and steganography. Steganography like cryptography is a very useful technique to achieve secrecy in communication. If both cryptography and steganography are used then the communication becomes t...

This paper describes a mechanism for secure online user authentication and document signature with a cryptogram Java card in an insecure environment. The mechanism requires possession of both the card and some secrets, known as Concepts, to authenticate the user. The concepts are represented in image form. A method of secure document signing with the concept-based images is also outlined. Possi...

Current alphanumeric and biometric authentication systems cannot withstand situations where a user is coerced into releasing their authentication materials under hostile circumstances. Existing approaches of coercion resistant authentication systems (CRAS) propose authentication factors such as implicit learning tasks, which are non-transferable, but still have the drawback that an attacker can...

Electronic communication is one of the popular ways of communication in this era. E-mail communication is the most popular way of electronic communication. Internet works as the backbone for these communications. In digital forensics, questions is arises that the authors of documents and the author identity, demographic background is linked to other documents or not. So identification of the au...

The evolution of web services has facilitated the integration of business processes scattered across different geographical locations of the world. Along with the benefits that web services provide for high value online transactions, it also poses some security threats. A new standard of XML aware digital signatures, recommended by W3C, provides authentication, data integrity, and support for n...

In this paper we discuss the unique security characteristics of cell phones in ad hoc mode for emergency applications. We assume as first security requirements: secure authentication with non-repudiation, the need to stop the spread of malicious information as soon as possible, and the defence against potential Denial of Service. We provide solutions to the above security challenges for cell ph...