482,509 research outputs found
An Active Attack on a Multiparty Key Exchange Protocol
The multiparty key exchange introduced in Steiner et al.\@ and presented in
more general form by the authors is known to be secure against passive attacks.
In this paper, an active attack is presented assuming malicious control of the
communications of the last two users for the duration of only the key exchange
A new key exchange protocol based on the decomposition problem
In this paper we present a new key establishment protocol based on the
decomposition problem in non-commutative groups which is: given two elements
of the platform group and two subgroups (not
necessarily distinct), find elements such that . Here we introduce two new ideas that improve the security of key
establishment protocols based on the decomposition problem. In particular, we
conceal (i.e., do not publish explicitly) one of the subgroups , thus
introducing an additional computationally hard problem for the adversary,
namely, finding the centralizer of a given finitely generated subgroup.Comment: 7 page
An active attack on a distributed Group Key Exchange system
In this work, we introduce an active attack on a Group Key Exchange protocol
by Burmester and Desmedt. The attacker obtains a copy of the shared key, which
is created in a collaborative manner with the legal users in a communication
group
Quantum Key Distribution (QKD) and Commodity Security Protocols: Introduction and Integration
We present an overview of quantum key distribution (QKD), a secure key
exchange method based on the quantum laws of physics rather than computational
complexity. We also provide an overview of the two most widely used commodity
security protocols, IPsec and TLS. Pursuing a key exchange model, we propose
how QKD could be integrated into these security applications. For such a QKD
integration we propose a support layer that provides a set of common QKD
services between the QKD protocol and the security applicationsComment: 12Page
Improved Bluetooth Key Exchange using Unbalanced RSA
In this thesis, a new protocol is proposed for the Bluetooth Key Exchange. The proposed key exchange will make use of a public-key algorithm as compared to the currently existing key exchange which only uses symmetric ciphers. The public-key algorithm to be used is a modified version of the RSA algorithm called Unbalanced RSA . The proposed scheme will improve on the currently existing key exchange scheme by improving the security while trying to minimize computation time. The proposed protocol will also improve on a recent work which used the Diffie-Hellman algorithm for Bluetooth key exchange. In using the Diffie-Hellman algorithm the security was increased from the original Bluetooth key exchange but the computation time and difficulty of computations was also increased. Two Bluetooth devices that are trying to communicate can have a wide range of processor speeds and the use of the Diffie-Hellman protocol can cause a large delay at one user. The use of Unbalanced RSA in the proposed protocol will aim to remedy this problem. The aim of the proposed protocol is to eliminate the security risks from the original Bluetooth key exchange and also address the computation time issue with the enhanced Diffie-Hellman key exchange
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