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Academic literature on the topic 'Caractérisation sécuritaire'
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Dissertations / Theses on the topic "Caractérisation sécuritaire"
Krakovinsky, Alexis. "Caractérisation sécuritaire des OxRRAM." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0654.
Full textThe first semi-conductor memories appeared in the 1960s. Since then,memories that are embedded on integrated circuits have evolved significantly. An important downsizing of these memories has been performed and they are still able to store more and more data. However, Flash technology-which is the most spread NVM technology nowadays - is facing scaling and power consumption issues. Numerous alternative solutions have emerged (emerging technologies) to replace Flash or to be integrated in smart objects, whose one of the main features is low power consumption. In the years to come, billions of devices connected to each other will exchange personal data that need to be secured. Flash technology has already been the subject of many studies, allowing it to be considered secured. Nevertheless, nothing has been performed yet on emerging NVM.This thesis proposes an evaluation of the secure character of one of these technologies, whose performances are promising: OxRAM. The first chapter of this manuscript deals with the state of the art of the different kind of existing memory technologies. It lists the different means that can be used to assess the security of a memory technology. This allowed to experiment attacks on an integrated circuit which embeds OxRAM. However, the results showed that more accurate studies are necessary to understand the observed effects. Chapters 3 and 4 will then demonstrate the vulnerabilities noticed on OxRAM memory cells through different LASER attacks. The source of these vulnerabilities has also been investigated, which allowed to propose tracks for countermeasures in order to protect integrated circuits that are to embed such memories
Krakovinsky, Alexis. "Caractérisation sécuritaire des OxRRAM." Electronic Thesis or Diss., Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0654.
Full textThe first semi-conductor memories appeared in the 1960s. Since then,memories that are embedded on integrated circuits have evolved significantly. An important downsizing of these memories has been performed and they are still able to store more and more data. However, Flash technology-which is the most spread NVM technology nowadays - is facing scaling and power consumption issues. Numerous alternative solutions have emerged (emerging technologies) to replace Flash or to be integrated in smart objects, whose one of the main features is low power consumption. In the years to come, billions of devices connected to each other will exchange personal data that need to be secured. Flash technology has already been the subject of many studies, allowing it to be considered secured. Nevertheless, nothing has been performed yet on emerging NVM.This thesis proposes an evaluation of the secure character of one of these technologies, whose performances are promising: OxRAM. The first chapter of this manuscript deals with the state of the art of the different kind of existing memory technologies. It lists the different means that can be used to assess the security of a memory technology. This allowed to experiment attacks on an integrated circuit which embeds OxRAM. However, the results showed that more accurate studies are necessary to understand the observed effects. Chapters 3 and 4 will then demonstrate the vulnerabilities noticed on OxRAM memory cells through different LASER attacks. The source of these vulnerabilities has also been investigated, which allowed to propose tracks for countermeasures in order to protect integrated circuits that are to embed such memories
Sarno, Thomas. "Caractérisation sécuritaire des mémoires magnétiques MRAM." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0796.
Full textMRAM (magnetoresistive RAM) is an emergent non-volatile memory technology; it has the particularity to store data in magnetic moments orientations. It has very interesting characteristics that overwhelm mature technologies on several points. Crocus Technology is developing a new MRAM technology called TAS-MRAM (for Thermally Assisted Switching). During write operations, this new MRAM technology uses a current to heat the memory cell. This reduces the power consumption and makes scalability easier. TAS-MRAM are developed for secure or critical applications but this technology relies on spintronic, a field of physics not much studied for electronics security.This work aims to evaluate potential security weaknesses of this technology. More specifically the memory capacity to guarantee data confidentiality was studied. This work was divided in two parts; one part is dedicated to the analysis of MRAM resistance against physical perturbations, with a special focus on magnetic fields (both static and pulsed) effects on read and write operations as well as their effects on data retention. Various methods to reduce these effects were tested and compared. The effect of high temperature was also studied.The second part focuses on the analysis of electromagnetic emissions of the MRAM components during its operations. Methods to retrieve the Hamming weight of data written in the memory are exposed and compared
Abelé, Raphaël. "Traitement d'images pour l'automatisation de caractérisation sécuritaire de circuits intégrés." Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0267.
Full textAutomation is a strategic issue in the industry. In the very particular context of the secure characterization of integrated circuits,we propose to automate the movement of the optical system of a laser injection bench. Through this work, our purpose is to make possible the automation of processes that initially require human intervention. We propose two tools, dedicated to the field of infrared vision of integrated circuits. Processes such as the targeting of electronic structures of interest can be automated with these tools.First, an automatic focusing process of the optical system is presented. It allows to focus the conductive tracks of the integrated circuit, according to specific contextual criteria. Two approaches are implemented, based on the analysis of images in the time-frequency domain: one approach uses a wavelet transformof the images, the other uses a polynomial transform. If they are both optimized for the analysis of infrared images, the resulting autofocuses have their own advantages: execution time for one, accuracy for the other.Second, we present a localization system for electronic structures. This system implements graph matching and uses decisive descriptors for our application. In our context, in addition to its robustness, our approach takes advantage of graphs in schemes recognition.Once implemented, these tools offer major perspectives to improve secure characterizations: component scans, optimization and reproducibility of characterization, recognition of components. Finally, computer vision is the key to many avenues opened through this work
Lacruche, Marc. "Caractérisation sécuritaire de circuits basse-consommation face aux attaques par laser." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4331/document.
Full textThe increasing complexity of integrated circuits and the explosion of the number of mobile devices today makes power consumption minimisation a priority in circuit design. However, it is necessary to make sure that it does not compromise the security of sensitive circuits. In this regard, physical attacks are a particular concern, as mobile devices are ideal targets for these attacks.This work aims at evaluating the impact of body-biasing on circuit vulnerability to laser attacks. These methods allow to dynamically adjust the performance/consumption ratio of a circuit by modifying the bias voltage of the body. It is divided in four chapters. It begins by introducing cryptography, physical attacks and low power design methods. Then the test bench used during this thesis is described, as well as the developpement work done in order to allow its automation. Then an initial study of the impact of short duration laser pulses on SRAM memories is presented. The third chapter reports the results of a laser fault injection campaign on memories subjected to Forward Body-Biasing. The results show a sensitivy increase of the circuits when supply voltage is lowered and FBB is activated. Based on these results, the last chapter introduces a method using the body-biasing and voltage scaling capabilities of a microcontroller to harden a hardware AES embedded on the latter.In conclusion, this works shows that low-power design methods can induce additional security risks if they are not carefully taken into account. However the additional capabilities of the circuits intended for power consumption reduction can be used in a different way to enhance device resillience to attacks
Lacruche, Marc. "Caractérisation sécuritaire de circuits basse-consommation face aux attaques par laser." Electronic Thesis or Diss., Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4331.
Full textThe increasing complexity of integrated circuits and the explosion of the number of mobile devices today makes power consumption minimisation a priority in circuit design. However, it is necessary to make sure that it does not compromise the security of sensitive circuits. In this regard, physical attacks are a particular concern, as mobile devices are ideal targets for these attacks.This work aims at evaluating the impact of body-biasing on circuit vulnerability to laser attacks. These methods allow to dynamically adjust the performance/consumption ratio of a circuit by modifying the bias voltage of the body. It is divided in four chapters. It begins by introducing cryptography, physical attacks and low power design methods. Then the test bench used during this thesis is described, as well as the developpement work done in order to allow its automation. Then an initial study of the impact of short duration laser pulses on SRAM memories is presented. The third chapter reports the results of a laser fault injection campaign on memories subjected to Forward Body-Biasing. The results show a sensitivy increase of the circuits when supply voltage is lowered and FBB is activated. Based on these results, the last chapter introduces a method using the body-biasing and voltage scaling capabilities of a microcontroller to harden a hardware AES embedded on the latter.In conclusion, this works shows that low-power design methods can induce additional security risks if they are not carefully taken into account. However the additional capabilities of the circuits intended for power consumption reduction can be used in a different way to enhance device resillience to attacks
Lavallée, Audrey. "Caractérisation des souvenirs définissant le soi de patients internés en hôpital psychiatrique sécuritaire avec un trouble de la personnalité antisociale." Thesis, Lille 3, 2020. http://www.theses.fr/2020LIL3H041.
Full textAutobiographical memory plays a core role in the self’s construction. It is through memories of experienced events that the identity notion is constructed and that life goals and problem-solving strategies are elaborated. Investigate autobiographical memory offers an overview of how individuals forge and perceive themselves through the prism of life story. In this thesis we have chosen to examine the autobiographical memory of men with antisocial personality disorder, having committed crimes and offences and inpatients in forensic hospital. Study their autobiographical memories and more specifically the characteristics of their self-defining memories allowed us to highlight deficits in their retrieval’s abilities. Their difficulties in structuring and in meaning making from their past events as well as the emotion of anger associated with their recall seem to indicate the influence of their traumatic history in their symptomatology. Through semi-qualitative, behavioral and physiological measures, we emphasized the importance of the integrative dimension in the identity process. Hence, this thesis, by its contribution of knowledge on antisocial personality disorder, opens new clinical and scientific perspectives