Controlled access to cloud resources for mitigating economic denial of sustainability (EDoS) attacks

Cloud computing is a paradigm that provides scalable IT resources as a service over the Internet. Vulnerabilities in the cloud infrastructure have been readily exploited by the adversary class. Therefore, providing the desired level of assurance to all stakeholders through safeguarding data (sensitive or otherwise) which is stored in the cloud, is of utmost importance. In addition, protecting the cloud from adversarial attacks of diverse types and intents, cannot be understated. Economic Denial of Sustainability (EDoS) attack is considered as one of the concerns that has stalled many organizations from migrating their operations and/or data to the cloud. This is because an EDoS attack targets the financial component of the service provider. In this work, we propose a novel and reactive approach based on a rate limit technique, with low overhead, to detect and mitigate EDoS attacks against cloud-based services. Through this reactive scheme, a limited access permission for cloud services is granted to each user. Experiments were conducted in a laboratory cloud setup, to evaluate the performance of the proposed mitigation technique. Results obtained show that the proposed approach is able to detect and prevent such an attack with low cost and overhead. © 2016 Elsevier B.V. All rights reserved

Secure PIN-Entry Method Using One-Time PIN (OTP)

The regular PIN-entry method has been still the most common method of authentication for systems and networks. However, PINs are easy to be captured through various attacks, including shoulder-surfing, video-recording, and spyware. This could be attributed to the involuntary nature of entering the original PIN during authentication. In this paper, we employ an indirect input method that utilizes the addition mod 10 and a mini-challenge keypad in order to produce a one-time PIN (OTP) that obscures the original PIN. The results of our user study manifest that the proposed PIN-entry method provides better security than the existing PIN-entry methods while maintaining an acceptable level of usability. Moreover, the user feedback fully support the use of the proposed PIN-entry method in critical-security situations