• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.1
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• pp.168-182
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• 2020

Spoofing attacks, especially replay attacks, pose great security challenges to automatic speaker verification (ASV) systems. Current works on replay attacks detection primarily focused on either developing new features or improving classifier performance, ignoring the effects of feature variability, e.g., the channel variability. In this paper, we first establish a mathematical model for replay speech and introduce a method for eliminating the negative interference of the channel. Then a novel feature is proposed to detect the replay attacks. To further boost the detection performance, four post-processing methods using normalization techniques are investigated. We evaluate our proposed method on the ASVspoof 2017 dataset. The experimental results show that our approach outperforms the competing methods in terms of detection accuracy. More interestingly, we find that the proposed normalization strategy could also improve the performance of the existing algorithms.

• Nuclear Engineering and Technology
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• v.54 no.10
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• pp.3864-3877
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• 2022

We propose a new approach called PESA (Prioritized replay Evolutionary and Swarm Algorithms) combining prioritized replay of reinforcement learning with hybrid evolutionary algorithms. PESA hybridizes different evolutionary and swarm algorithms such as particle swarm optimization, evolution strategies, simulated annealing, and differential evolution, with a modular approach to account for other algorithms. PESA hybridizes three algorithms by storing their solutions in a shared replay memory, then applying prioritized replay to redistribute data between the integral algorithms in frequent form based on their fitness and priority values, which significantly enhances sample diversity and algorithm exploration. Additionally, greedy replay is used implicitly to improve PESA exploitation close to the end of evolution. PESA features in balancing exploration and exploitation during search and the parallel computing result in an agnostic excellent performance over a wide range of experiments and problems presented in this work. PESA also shows very good scalability with number of processors in solving an expensive problem of optimizing nuclear fuel in nuclear power plants. PESA's competitive performance and modularity over all experiments allow it to join the family of evolutionary algorithms as a new hybrid algorithm; unleashing the power of parallel computing for expensive optimization.

• IEMEK Journal of Embedded Systems and Applications
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• v.9 no.1
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• pp.1-9
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• 2014

As Android platform and its applications are widely used, it is necessary to assure the reliability and safety of Android applications. The capture and replay technique is widely used for reproducing the crashes in Java applications. In this paper, we adapt the context-based capture and replay technique to Android applications by considering Android activity structure and its GUI characteristics. Our capture and replay technique uses probe code insertion based on AspectJ for minimizing the original code change and for enhancing the efficiency and reusability of the probe codes. For proving the efficiency of our technique, we provide a case study and execution overhead comparisons with related works, in which our approach has merits in GUI oriented Android applications with relatively low execution overhead.

• International Journal of Contents
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• v.16 no.4
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• pp.78-83
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• 2020

VR technology has become a game changer in the game industry. VR game market has increased exponentially worldwide. The current study is designed to examine effects of VR game players' gender (male vs. female), types of VR games (solo game vs. multiplayer game), and the level of perceived virtual presence (low virtual presence vs. high virtual presence) on enjoyment and intention to replay. Study findings suggest that male players, after playing VR games, showed higher enjoyment and intention to replay VR games. In terms of types of VR games, multiplayer VR games lead to higher enjoyment intention to replay than solo play games. Finally, this study found that the high level of perceived virtual presence incur higher enjoyment and intention to replay than the low level of perceived virtual presence in playing VR games. Practical implications were discussed in the last section of this paper.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.9
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• pp.2043-2049
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• 2012

Because of the growth of internet and development of smart phone technology, peoples are able to connect the internet easily and convenient at anytime, and anywhere. The other hand, that take place many serious social side-effect and one of a typical cases is the problem of malicious replay in weaken of netizen's internet ethics. The problem of malicious replay is increasing more and more the seriousness of the problem and the victims are suffering from much the pains of the trauma by a malicious replay. Therefore, in this paper, we investigate and analyze actual on aware of internet ethics and malicious replay for university students and then we propose the improvement of the problem.

• Journal of Advanced Navigation Technology
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• v.14 no.3
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• pp.415-425
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• 2010

In public network, user authentication is important security technology. Especially, password-based authentication method is used the most widely in distributed environments, and there are many authentication methods. Their SPMA protocol indicates vulnerability about problem that NSPA protocol does not offer mutual authentication, and proposed Strong Password Mutual Authentication protocol with mutual authentication. However, SPMA protocol has vulnerability of replay attack. In the paper, we analyzed vulnerability to replay attack of SPMA protocol. And we also proposed Improved Strong Password Mutual Authentication protocol to secure on replay attack with same efficiency.

• The KIPS Transactions:PartA
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• v.18A no.5
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• pp.177-180
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• 2011

In this paper, we present a record-replay technique based on interrupt logging and reproduction. Race conditions have been considered as the main source of nondeterminism in conventional record-replay approaches. However, interrupts are another source of nondeterministic computer system behavior, which must be reproduced at accurate time points, let alone the order of interrupt occurrence. We show that an interrupt-based replayer can be efficiently and effectively implemented by using hardware performance counters and debugging functionality. Experiments also show that the runtime overhead of the interrupt-based replayer is sufficiently low.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.6
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• pp.133-140
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• 2011

Password-based authentication is the protocol that two entities share a password in advance and use the password as the basic of authentication. Password authentication schemes are divided into weak-password and strong-password authentication scheme. SPAS protocol, one of the strong-password authentication scheme, was proposed for secure against DoS attack. However it has vulnerability of the replay attack. In this paper, we analyze the vulnerability to the replay attack in SPAS protocol. Then we also propose an Improved-Strong Password Authentication Scheme (I-SPAS) with secure against the replay attack.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.247-250
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• 2019

The first-generation RKE(Remote Keyless Entry) system is very vulnerable to replay attacks and the encryption of the second-generation RKE system is known to be disabled by four to eight signal receptions and analysis. In order to enhance the security of the RKE system, we introduce a physical-layer security methods in the RKE system and propose a technique to disable the replay attack by reducing the quality of the signal received by an eavesdropper.

• Journal of KIISE:Information Networking
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• v.36 no.2
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• pp.90-97
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• 2009

In 2008, Kim-Jun proposed a RFID mutual authentication protocol using one-time random number that can withstand malicious attacks by the leakage of important information and resolve the criminal abuse problems. Through the security analysis, they claimed that the proposed protocol can withstand various security attacks including the replay attack. However, this paper demonstrates that Kim-Jun' s RFID authentication protocol still insecure to the replay attack. In addition, this paper also proposes a simply improved RFID mutual authentication protocol using one-time random number which not only provides same computational efficiency, but also withstands the replay attack.