799 research outputs found
Cryptanalysis of an Efficient Signcryption Scheme with Forward Secrecy Based on Elliptic Curve
The signcryption is a relatively new cryptographic technique that is supposed
to fulfill the functionalities of encryption and digital signature in a single
logical step. Several signcryption schemes are proposed throughout the years,
each of them having its own problems and limitations. In this paper, the
security of a recent signcryption scheme, i.e. Hwang et al.'s scheme is
analyzed, and it is proved that it involves several security flaws and
shortcomings. Several devastating attacks are also introduced to the mentioned
scheme whereby it fails all the desired and essential security attributes of a
signcryption scheme.Comment: 5 Pages, 2 Figure
LPKI - A Lightweight Public Key Infrastructure for the Mobile Environments
The non-repudiation as an essential requirement of many applications can be
provided by the asymmetric key model. With the evolution of new applications
such as mobile commerce, it is essential to provide secure and efficient
solutions for the mobile environments. The traditional public key cryptography
involves huge computational costs and is not so suitable for the
resource-constrained platforms. The elliptic curve-based approaches as the
newer solutions require certain considerations that are not taken into account
in the traditional public key infrastructures. The main contribution of this
paper is to introduce a Lightweight Public Key Infrastructure (LPKI) for the
constrained platforms such as mobile phones. It takes advantages of elliptic
curve cryptography and signcryption to decrease the computational costs and
communication overheads, and adapting to the constraints. All the computational
costs of required validations can be eliminated from end-entities by
introduction of a validation authority to the introduced infrastructure and
delegating validations to such a component. LPKI is so suitable for mobile
environments and for applications such as mobile commerce where the security is
the great concern.Comment: 6 Pages, 6 Figure
Remarks on combinatorial aspects of the KP Equation
Accepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureAccepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureAccepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureAccepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureNSF through grant DMS-0807705; AR is supported by the NSF under grant DMS-100438
SSMS - A Secure SMS Messaging Protocol for the M-payment Systems
The GSM network with the greatest worldwide number of users, succumbs to
several security vulnerabilities. The short message service (SMS) is one of its
superior and well-tried services with a global availability in the GSM
networks. The main contribution of this paper is to introduce a new secure
application layer protocol, called SSMS, to efficiently embed the desired
security attributes in the SMS messages to be used as a secure bearer in the
m-payment systems. SSMS efficiently embeds the confidentiality, integrity,
authentication, and non-repudiation in the SMS messages. It provides an
elliptic curve-based public key solution that uses public keys for the secret
key establishment of a symmetric encryption. It also provides the attributes of
public verification and forward secrecy. It efficiently makes the SMS messaging
suitable for the m-payment applications where the security is the great
concern.Comment: 6 Pages, 5 Figure
The effect of height in vaulted tunnels on the stability parameters
This paper presents the effect of height of vaulted tunnels on the stability parameters such as surface settlement, displacement and yielded elements around tunnels. This effect has been investigated in tunnels with different upper arches. Numerical analysis is done by a 2D finite element program with software Phase2, whereby vaulted tunnels are modeled with different upper arches and with widths of 4, 6, 8 and 10 meters and the heights of 3, 5 and 7 meters. The results of the evaluations show that by decreasing the height of tunnels, the stability parameters have improved for all the radius of tunnel arch. Furthermore, variations of the surface settlement, displacement and yielded elements around tunnels has reduced when width of tunnel become larger from radius of tunnel arch
A new approach to content-based file type detection
File type identification and file type clustering may be difficult tasks that
have an increasingly importance in the field of computer and network security.
Classical methods of file type detection including considering file extensions
and magic bytes can be easily spoofed. Content-based file type detection is a
newer way that is taken into account recently. In this paper, a new
content-based method for the purpose of file type detection and file type
clustering is proposed that is based on the PCA and neural networks. The
proposed method has a good accuracy and is fast enough.Comment: 6 Pages, 5 Figure, 2 Table
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