Dissertations / Theses on the topic 'Trojan Attack'
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Shanmugam, Karthikeyan. "Validating digital forensic evidence." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/7651.
Full textWang, Xinmu. "HARDWARE TROJAN ATTACKS: THREAT ANALYSIS AND LOW-COST COUNTERMEASURES THROUGH GOLDEN-FREE DETECTION AND SECURE DESIGN." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1378489509.
Full textKortelainen, T. (Tuomas). "On iteration-based security flaws in modern hash functions." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526206431.
Full textTiivistelmä Vuonna 1989 Ralph Merkle ja Ivan Damgård ehdottivat toisistaan riippumatta hash-funktioille suunnitteluperiaatteita, joita käytetään tänä päivänä laajasti. Niin kutsuttu Merkle-Damgård -rakenne lukee viestin sisään viestiblokki kerrallaan ja käyttää tiivistefunktiota, joka liittää hash-arvoon ja viestiblokkiin uuden hash-arvon. Tällä iteratiivisella rakenteella on joitakin turvallisuusheikkouksia. Se on haavoittuva esimerkiksi Joux’n monitörmäyshyökkäykselle, timanttirakenteita hyödyntävälle paimennushyökkäykselle ja Troijan viesti -hyökkäykselle. Väitöskirjan pääasiallinen tutkimusaihe on Merkle-Damgård -rakenteen aiheuttamat puutteet tietoturvassa. Tässä työssä esitetään uusi versio Joux’n monitörmäyshyökkäyksestä, luodaan uusi aikaa säästävä algoritmi timanttirakenteiden kehittämiseksi ja kaksi uutta tehokasta versiota Troijan viesti -hyökkäyksestä. Väitöskirjan tärkein kontribuutio on yleistettyjen iteratiivisten hash-funktioiden turvallisuuden analysointi. Sanojen kombinatorisia ominaisuuksia tutkitaan uudesta näkökulmasta, jonka pohjalta kehitettyjä tuloksia soveltamalla luodaan uusi yläraja niin kutsuttujen q-rajoitettujen yleisten iteratiivisten hash-funktioiden monitörmäyshyökkäysten kompleksisuudelle
Makarov, Vadim. "Quantum cryptography and quantum cryptanalysis." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1473.
Full textThis doctoral thesis summarizes research in quantum cryptography done at the Department of Electronics and Telecommunications at the Norwegian University of Science and Technology (NTNU) from 1998 through 2007.
The opening parts contain a brief introduction into quantum cryptography as well as an overview of all existing single photon detection techniques for visible and near infrared light. Then, our implementation of a fiber optic quantum key distribution (QKD) system is described. We employ a one-way phase coding scheme with a 1310 nm attenuated laser source and a polarization-maintaining Mach-Zehnder interferometer. A feature of our scheme is that it tracks phase drift in the interferometer at the single photon level instead of employing hardware phase control measures. An optimal phase tracking algorithm has been developed, implemented and tested. Phase tracking accuracy of +-10 degrees is achieved when approximately 200 photon counts are collected in each cycle of adjustment. Another feature of our QKD system is that it uses a single photon detector based on a germanium avalanche photodiode gated at 20 MHz. To make possible this relatively high gating rate, we have developed, implemented and tested an afterpulse blocking technique, when a number of gating pulses is blocked after each registered avalanche. This technique allows to increase the key generation rate nearly proportionally to the increase of the gating rate. QKD has been demonstrated in the laboratory setting with only a very limited success: by the time of the thesis completion we had malfunctioning components in the setup, and the quantum bit error rate remained unstable with its lowest registered value of about 4%.
More than half of the thesis is devoted to various security aspects of QKD. We have studied several attacks that exploit component imperfections and loopholes in optical schemes. In a large pulse attack, settings of modulators inside Alice's and Bob's setups are read out by external interrogating light pulses, without interacting with quantum states and without raising security alarms. An external measurement of phase shift at Alice's phase modulator in our setup has been demonstrated experimentally. In a faked states attack, Eve intercepts Alice's qubits and then utilizes various optical imperfections in Bob's scheme to construct and resend light pulses in such a way that Bob does not distinguish his detection results from normal, whereas they give Bob the basis and bit value chosen at Eve's discretion. Construction of such faked states using several different imperfections is discussed. Also, we sketch a practical workflow of breaking into a running quantum cryptolink for the two abovementioned classes of attacks. A special attention is paid to a common imperfection when sensitivity of Bob's two detectors relative to one another can be controlled by Eve via an external parameter, for example via the timing of the incoming pulse. This imperfection is illustrated by measurements on two different single photon detectors. Quantitative results for a faked states attack on the Bennett-Brassard 1984 (BB84) and the Scarani-Acin-Ribordy-Gisin 2004 (SARG04) protocols using this imperfection are obtained. It is shown how faked states can in principle be constructed for quantum cryptosystems that use a phase-time encoding, the differential phase shift keying (DPSK) and the Ekert protocols. Furthermore we have attempted to integrate this imperfection of detectors into the general security proof for the BB84 protocol. For all attacks, their applicability to and implications for various known QKD schemes are considered, and countermeasures against the attacks are proposed.
The thesis incorporates published papers [J. Mod. Opt. 48, 2023 (2001)], [Appl. Opt. 43, 4385 (2004)], [J. Mod. Opt. 52, 691 (2005)], [Phys. Rev. A 74, 022313 (2006)], and [quant-ph/0702262].
Dubell, Michael, and David Johansson. "Nätverkssäkerhet med IPS : Förbättrad nätverkssäkerhet med Intrusion Prevention Systems." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-23347.
Full textTheerthagiri, Dinesh. "Reversing Malware : A detection intelligence with in-depth security analysis." Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52058.
Full textMore money nowadays moves online and it is very understandable that criminals want to make more money online aswell, because these days’ banks don’t have large sums of money in their cash box. Since there are many other internalrisks involved in robbing a bank, criminals have found many other ways to commit crimes and much lower risMore money nowadays moves online and it is very understandable that criminals want to make more money online as well, because these days’ banks don’t have large sums of money in their cash box. Since there are many other internal risks involved in robbing a bank, criminals have found many other ways to commit crimes and much lower risk in online crime. The first level of change involved was email-based phishing, but later circumstances changed again.
Authentication methods and security of online bank has been improved over the period. This will drastically reduce effects of phishing based on emails and fraudulent website. The next level of online bank fraud is called banking Trojans. These Trojans infect the online customers of banks. These Trojans monitors customer’s activities and uses their authenticated session to steal customers’ money.
A lot of money is made by these kinds of attacks. Comparatively few perpetrators have been caught, and the problem is getting worse day by day. To have a better understanding of this problem, I have selected a recent malware sample named as SilentBanker. It had the capability of attacking more than 400 banks. This thesis presents the problem in general and includes my results in studying the behaviour of the SilentBanker Trojan.
Grillo, Jose Geraldo Costa. "A Guerra de Tróia no imaginário ateniense: sua representação nos vasos áticos dos séculos VI-V a.C." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/71/71131/tde-13042009-164013/.
Full textFrom the iconography of the Trojan War, the author asks about the place of the war in the Athenian imaginary in the sixth and fifth centuries B.C. The corpus of the research is composed of 248 attic vases about nine scenes: 1) The arming of Achilles; 2) The departure of Achilles; the duels: 3) Paris fighting Menelaos, 4) Aeneas fighting Diomedes, 5) Ajax fighting Hector, 6) Achilles fighting Hector, 7) Achilles fighting Memnon; the returns of the dead warriors in battle: 8) Sleep and Death carrying the body of Sarpedon, and 9) Ajax carrying the body of Achilles. The choice of space, Athens, and chronological period, 6th and 5th centuries B.C., was based on a deliberate option for the attic vases and on the appearance and disappearance of the theme in this period. Based on the assumptions that there is a relationship between images and society and that images are constructs of the social imaginary, allowing an approximation to collective representations, the author proposes that the Trojan War is a constituent element of the Athenian imaginary in the sixth and fifth centuries B.C. and that its iconography refers to the representations of Athenians on the war activity in their own time. The Trojan Wars painted pictures, rather than being illustrations of an event from the past, are manifestations of the image that the city of Athens makes about itself, concerning the war. The Trojan War is an event in the collective memory of the Athenians, upon which the city establishes its values, its society and the respective roles of its citizens. In short, that war, rather than being an activity restricted to warriors, concerns the whole city, namely, the non-warriors, among them, the woman and the old man, the warriors parents, who hold an important place.
Exurville, Ingrid. "Détection non destructive de modification malveillante de circuits intégrés." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0800/document.
Full textThe globalization of integrated circuits fabrication involves several questions about the integrity of the fabricated circuits. Malicious modifications called Hardware Trojans (HT) can be introduced during the circuit production process. Due to the complexity of an integrated circuit, it is really difficult to find this kind of alterations.This work focuses on a non-destructive method of HT detection. We use the paths delays of the studied design as a channel to detect HT. A model to describe paths delays is defined. It takes into account two important parameters which are the experimental conditions and the process variations.Faults attacks by clock glitches based on timing constraints violations have been performed to measure data paths delays. Reliable circuits are used for reference. After validating the relevance of this channel to get information on the internal behavior of the targeted design, experimental detections of HT inserted on two different abstraction levels (RTL and after place and route) were achieved. Process variations are taken into consideration in the studies to detect if the tested circuits are infected
Henningsson, Daniel. "Från Ilions fält till Nilens stränder : En studie rörande identifieringen mellan teukrerna och sjöfolket ṯ-k-(k)-r." Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385465.
Full textSujimoto, Fernando Ribeiro. "Polimorfismo e polietismo na comunicação química, comportamento de limpeza e trofalaxia em Atta sexdens rubropilosa (Hymenoptera: Formicidae)." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-30072018-160416/.
Full textAnts are eusocial insects intensely dependent on chemical communication. They have morphological, biochemical, physiological and behavioral features adapted to a life surrounded by many molecules messages. Furthermore, each olfactory peculiarity in any of the biological level mentioned above, reflects on the highly polymorphic patterns found in the colonies of the most derived groups, as the leaf cutter ants (Attini). Thus, the castes and sub castes of Atta ants, would have characteristics, as olfactory organs and electrophysiological sensibility, that vary following the body sizes and tasks performed in the colonies. Therefore, it would have a direct or indirect correlation among the sizes of the ants, their ethological profiles and the chemical communication in these species. This relation could be seen over different activities, as the grooming and oral trophallaxis. In this way, this thesis focus in the interaction among the polymorphism, polyethism and chemical communication in Atta sexdens. It still describes the participation of workers and queen in grooming and trophallaxis, linking them to a possible role in cuticular hydrocarbon dispersion over the colony. The thesis is divided in four chapters. In the Chapter 1, it is presented an introduction to the knowledge explored in all thesis, and also its outline. In the Chapter 2, there is a quantitative and qualitative description of sensilla from all castes and sub castes of A. sexdens, showing that these sensory organs vary following the polymorphic patterns and ethological profiles. The Chapter 3 explores the differences in the antennae electrophysiological responses to three pheromones, comparing them with all polymorphic groups of A. sexdens. The results demonstrate similarities and discrepancies in the sensibility to the contents of poison, Dufour and mandibular glands among the sub castes (gardeners, generalists, foragers and soldiers), and also between males and queens, enabling a correlation with their tasks. In the Chapter 4, it is investigated the roles of each type of A. sexdens workers in the trophallaxis, allogrooming and self-grooming behaviors, relating them with the queen presence. Additionally, and based in the results, the different roles of the sub castes can be associated to a possible action of grooming and trophallaxis in the dispersion of intraspecific recognition molecules and in the formation of a colony chemical gestalt. All results and discussion distributed along the thesis, therefore, contribute to a better understanding of a complex scenario, supported by the eusociality, chemical ecology, olfactory perception and behavior of the leaf cutter ants.
Benhani, El mehdi. "Sécurité des systèmes sur puce complexes hétérogènes." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES016.
Full textThe thesis studies the security of the ARM TrustZone technology in the context of complex heterogeneous SoCs. The thesis presents hardware attacks that affect elements of the SoCs architecture and it also presents countermeasure strategies
Moein, Samer. "Systematic Analysis and Methodologies for Hardware Security." Thesis, 2015. http://hdl.handle.net/1828/6954.
Full textGraduate
0544
0984
samerm@uvic.ca
Man-HsuanKuo and 郭蔓萱. "Time-Related Hardware Trojan Attacks on Processor Cores." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5ea6rz.
Full text國立成功大學
電機工程學系
107
This thesis presents two hardware Trojan designs that employ time information as a trigger condition based on the understanding of the time maintenance and update mechanism on a modern system. One is a real-time based Trojan, which will attack a system at some specific real-world time. The other is a relative-time based Trojan, which will be triggered when a specific time passes after the system is powered on. In either case, when a hardware Trojan is triggered, its payload circuit will corrupt the system or leakage internal confidential information to the attackers. In addition, this thesis also presents a hardware design scheme, which allows the trigger condition to be programmed after the chip is manufactured. The proposed time-related hardware Trojans have been inserted into an open-source processor and some of the current Trojan detection methods have been used to evaluate the effectiveness of the time-related hardware Trojans. Moreover, we implement the time- related hardware Trojans in the FPGA boards to demonstrate the attack effect. Experimental results show that the extra delay, area and power consumption are very small. In addition, we also use commercial verification tools and Trojan feature extraction detection technology to evaluate the presented hardware Trojans. Analysis results show that the above methods are not effective or additional test assertions are needed to detect the presented Trojan designs.
Mattison, Kathryn Magill. "Recasting Troy in Fifth-century Attic Tragedy." Thesis, 2009. http://hdl.handle.net/1807/19060.
Full textMancilla, Cristian. "Artistic and literary representations of the Judgement of Paris in antiquity." Master's thesis, 2015. http://hdl.handle.net/1885/14130.
Full text(9034049), Miguel Villarreal-Vasquez. "Anomaly Detection and Security Deep Learning Methods Under Adversarial Situation." Thesis, 2020.
Find full textAdvances in Artificial Intelligence (AI), or more precisely on Neural Networks (NNs), and fast processing technologies (e.g. Graphic Processing Units or GPUs) in recent years have positioned NNs as one of the main machine learning algorithms used to solved a diversity of problems in both academia and the industry. While they have been proved to be effective in solving many tasks, the lack of security guarantees and understanding of their internal processing disrupts their wide adoption in general and cybersecurity-related applications. In this dissertation, we present the findings of a comprehensive study aimed to enable the absorption of state-of-the-art NN algorithms in the development of enterprise solutions. Specifically, this dissertation focuses on (1) the development of defensive mechanisms to protect NNs against adversarial attacks and (2) application of NN models for anomaly detection in enterprise networks.
In this state of affairs, this work makes the following contributions. First, we performed a thorough study of the different adversarial attacks against NNs. We concentrate on the attacks referred to as trojan attacks and introduce a novel model hardening method that removes any trojan (i.e. misbehavior) inserted to the NN models at training time. We carefully evaluate our method and establish the correct metrics to test the efficiency of defensive methods against these types of attacks: (1) accuracy with benign data, (2) attack success rate, and (3) accuracy with adversarial data. Prior work evaluates their solutions using the first two metrics only, which do not suffice to guarantee robustness against untargeted attacks. Our method is compared with the state-of-the-art. The obtained results show our method outperforms it. Second, we proposed a novel approach to detect anomalies using LSTM-based models. Our method analyzes at runtime the event sequences generated by the Endpoint Detection and Response (EDR) system of a renowned security company running and efficiently detects uncommon patterns. The new detecting method is compared with the EDR system. The results show that our method achieves a higher detection rate. Finally, we present a Moving Target Defense technique that smartly reacts upon the detection of anomalies so as to also mitigate the detected attacks. The technique efficiently replaces the entire stack of virtual nodes, making ongoing attacks in the system ineffective.