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Dissertations / Theses on the topic 'Certificats SSL'

Author: Grafiati

Published: 23 September 2022

Last updated: 19 July 2025

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1

Traore, Mohamed. "Analyse des biais de RNG pour les mécanismes cryptographiques et applications industrielles." Thesis, Université Grenoble Alpes, 2022. http://www.theses.fr/2022GRALM013.

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Dans ce travail, nous analysons des certificats SSL/TLS X.509 (utilisant le chiffrement RSA et provenant de centaines de millions de matériels connectés) à la recherche d'anomalies et étendons notamment les travaux de Hastings, Fried et Heninger (2016). Notre étude a été réalisée sur trois bases de données provenant de l'EFF (2010-2011), de l'ANSSI (2011-2017) et de Rapid7 (2017-2021). Plusieurs vulnérabilités affectant des matériels de fabricants connus furent détectées : modules de petites tailles (strictement inférieures à 1024 bits), modules redondants (utilisés par plusieurs entités), cer

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2

Bruhner, Carl Magnus, and Oscar Linnarsson. "Relay Racing with X.509 Mayflies : An Analysis of Certificate Replacements and Validity Periods in HTTPS Certificate Logs." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167063.

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Certificates are the foundation of secure communication over the internet as of today. While certificates can be issued with long validity periods, there is always a risk of having them compromised during their lifetime. A good practice is therefore to use shorter validity periods. However, this limits the certificate lifetime and gives less flexibility in the timing of certificate replacements. In this thesis, we use publicly available network logs from Rapid7's Project Sonar to provide an overview of the current state of certificate usage behavior. Specifically, we look at the Let's Encrypt

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3

Boinapally, Kashyap. "Security Certificate Renewal Management." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18453.

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Context. An SSL encrypted client-server communication is necessary to maintain the security and privacy of the communication. For an SSL encryption to work, there should be a security certificate which has a certain expiry period. Periodic renewal of the certificate after its expiry is a waste of time and an effort on part of the company. Objectives. In this study, a new system has been developed and implemented, which sends a certificate during prior communication and does not wait for the certificate to expire. Automating the process to a certain extent was done to not compromise the securit

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4

Klasson, Sebastian, and Nina Lindström. "Longitudinal analysis of the certificate chains of big tech company domains." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-178396.

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The internet is one of the most widely used mediums for communication in modern society and it has become an everyday necessity for many. It is therefore of utmost importance that it remains as secure as possible. SSL and TLS are the backbones of internet security and an integral part of these technologies are the certificates used. Certificate authorities (CAs) can issue certificates that validate that domains are who they claim to be. If a user trusts a CA they can in turn also trust domains that have been validated by them. CAs can in turn trust other CAs and this, in turn, creates a chain

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5

Gustafsson, Josef. "Certificate Transparency in Theory and Practice." Thesis, Linköpings universitet, Databas och informationsteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125855.

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Certificate Transparency provides auditability to the widely used X.509 Public Key Infrastructure (PKIX) authentication in Transport Layer Security (TLS) protocol. Transparency logs issue signed promises of inclusions to be used together with certificates for authentication of TLS servers. Google Chrome enforces the use of Certificate Transparency for validation of Extended Validation (EV) certificates. This thesis proposes a methodology for asserting correct operation and presents a survey of active Logs. An experimental Monitor has been implemented as part of the thesis. Varying Log usage pa

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6

Meihong, Li, Zhang Qishan, and Wang Jun. "RESEARCH AND IMPLEMENTATION OF MOBILE BANK BASED ON SSL." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605837.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>SSL protocol is one industrial standard to protect data transferred securely on Internet. Firstly SSL is analyzed, according to its characteristics, one solution plan on mobile bank based on SSL is proposed and presented, in which GPRS technology is adopted and elliptic curve algorithm is used for the session key, finally several functional modules of mobile bank are designed in details and its security is analyzed.

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7

Khanna, Isha. "Phishing on Open WLANs: Threat and Preventive Measure." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/36170.

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Phishing is an internet security issue whose shape is still changing and size is still increasing. This thesis shows the possibility of a phishing attack on open, private Wireless LANs. Private WLANs which use a login page to authenticate users in hotels, airports and academic campuses are all vulnerable to this attack. Virginia Tech's WLAN is used as an example to show that the attack is possible. The attack combines two very well known attacks: one is to deceptively guide a user into logging into a fake website, which shows similar log-in page to the page of the website the user intends to g

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8

Collett, Torstein Calvin. "Simple SSH Management." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9130.

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SSH certificates are used by administrators so connections to the server can be verified. This ensures that only authorized administrators can access the server and that the server being accessed is the intended machine. Current solutions for managing SSH certificates are focused on commercial use, which makes them cumbersome for small groups and individuals to use. These solutions require running multiple services that companies already use but add significant overhead for smaller groups. We developed a new standalone system that makes it easy to manage SSH certificates for small amounts of s

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9

Dotzky, Jesper, and Jon Wiklund. "Extern Web-service-lösning vid SSAB Tunnplåt i Borlänge- för kommunikation med sina distributions lager." Thesis, Högskolan Dalarna, Informatik, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:du-401.

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Detta examensarbete har utförts på SSAB- Tunnplåt i Borlänge under vårterminen 2004 och omfattar 10 veckors arbete.SSAB sköter idag sin kommunikation med distributionslagren via fax, telefon eller e-post. Eftersom detta är ett ganska tidskrävande kommunikationssätt, vill SSAB ha en smidigare och snabbare kommunikationslösning. Den lösning som SSAB vill ha är en extern Web-service-lösning för att upprätta en säker kommunikation med sina distributionslager.Parallellt med byggandet av Web-service-lösningen arbetades en förvaltningsmodell fram. Den beskriver hur förvaltningsorganisationen med dess

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10

Petersson, Jakob. "Analysis of Methods for Chained Connections with Mutual Authentication Using TLS." Thesis, Linköpings universitet, Informationskodning, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119455.

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TLS is a vital protocol used to secure communication over networks and it provides an end- to-end encrypted channel between two directly communicating parties. In certain situations it is not possible, or desirable, to establish direct connections from a client to a server, as for example when connecting to a server located on a secure network behind a gateway. In these cases chained connections are required. Mutual authentication and end-to-end encryption are important capabilities in a high assur- ance environment. These are provided by TLS, but there are no known solutions for chained conne

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Klepáčková, Karolína. "Aplikace pro Android na bezpečnostní monitorování komunikace." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399203.

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This diploma thesis is focused on implementation of application for security monitoring of network communication of other applications in mobile device with Android platform. Provides users information about security risks that may harm his/her privacy or device. It uses a local VPN to tunnel all data sent to the wireless network. These can be linked to an application that has sent them because the Android kernel is derived from the Linux kernel and can be used to retrieve information about established network connections and the application identifier associated with the connection. This mapp

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12

O'Neill, Mark Thomas. "The Security Layer." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7761.

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Transport Layer Security (TLS) is a vital component to the security ecosystem and the most popular security protocol used on the Internet today. Despite the strengths of the protocol, numerous vulnerabilities result from its improper use in practice. Some of these vulnerabilities arise from weaknesses in authentication, from the rigidity of the trusted authority system to the complexities of client certificates. Others result from the misuse of TLS by developers, who misuse complicated TLS libraries, improperly validate server certificates, employ outdated cipher suites, or deploy other featur

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13

Rennét, Jiří. "Bezpečnost elektronického bankovnictví pro firmu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2010. http://www.nusl.cz/ntk/nusl-222646.

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Master’s thesis analyzes in detail the security of electronic banking within the chosen banks in Czech republic. On the base of these knowledge it defines and recommendes the most secure electronic banking for Profes Project s.r.o. company. In the folowing it investigates a current electronic banking in the company and it carries out basic theoretical findings.

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14

Slavík, Petr. "Laboratorní úloha infrastruktury veřejných klíčů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217981.

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The aim of this thesis is to study and describe the theme of Public Key Infrastructure (PKI). Within the scope of minute PKI characterization there is a gradual depiction of particular structural elements, which are above all represented by cryptographic operations (asymetric and symetric cryptography, hash function and digital signature); then, there are also individual PKI subjects that are dealt with, like eg. certification authority, certificates, security protocols, secure heap etc. Last but not least there are a few complete Public Key Infrastructure implementation solutions described (O

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15

Rapp, Axel. "Web site security maturity of the European Union and its member states : A survey study on the compliance with best practices of DNSSEC, HSTS, HTTPS, TLS-version, and certificate validation types." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-20127.

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With e-governance steadily growing, citizen-to-state communication via Web sites is as well, placing enormous trust in the protocols designed to handle this communication in a secure manner. Since breaching any of the protocols enabling Web site communication could yield benefits to a malicious attacker and bring harm to end-users, the battle between hackers and information security professionals is ongoing and never-ending. This phenomenon is the main reason why it is of importance to adhere to the latest best practices established by specialized independent organizations. Best practice compl

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16

Cakir, Ece. "Single Sign-On : Risks and Opportunities of Using SSO (Single Sign-On) in a Complex System Environment with Focus on Overall Security Aspects." Thesis, Linnéuniversitetet, Institutionen för datavetenskap (DV), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-24377.

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Main concern of this thesis is to help design a secure and reliable network system which keeps growing in complexity due to the interfaces with multiple logging sub-systems and to ensure the safety of the network environment for everyone involved. The parties somewhat involved in network systems are always in need of developing new solutions to security problems and striving to have a secure access into a network so as to fulfil their job in safe computing environments. Implementation and use of SSO (Single Sign-On) offering secure and reliable network in complex systems has been specifically

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17

Castillo, Gallo Jessenia, and Segovia Roberto Vicencio. "Propuesta de mejora del sistema de medición de indicadores de gestión de la calidad de la empresa BYLL SRL contratistas generales certificada bajo la norma ISO 9001 – 2008." Master's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2016. http://hdl.handle.net/10757/620923.

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Propone lograr la mejora del sistema de medición de indicadores de gestión de la calidad de la empresa constructora ByLL SRL Contratistas Generales, certificada bajo la norma ISO 9001 – 2008 desde el año 2011, esto con la finalidad de promover la mejora continua a través del logro de los objetivos de la calidad y de la eficacia de los procesos del sistema de gestión, logrando que estos indicadores proporcionen a la alta dirección, información relevante para la toma de decisiones en tiempo oportuno. Tomando en cuenta que ByLL se encuentra certificada desde el año 2011 y con la finalidad de s

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18

Hořejš, Jan. "Anonymní pohyb v síti internet." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220609.

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The objective of this master’s thesis was to describe current capabilities of anonymous browsing over the Internet. The theoretical part focuses on three main methods of anonymization with main focus on Tor network. The master‘s thesis describes advantages and disadvantages of different solutions and possible attacks on them. In the next part is demonstrated Tor network, implementation of Hidden service and secured access to the server for clients and possible attacks against this proposal. The work also includes the results of measurements of all three anonymizers and the effects on their spe

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19

Doležel, Radek. "Návrh bezpečnostní infrastruktury elektronického archivu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218135.

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This master's thesis deals with design of security infrastructure for electronic archive. In theoretical part is disscus about technical resources which are based on security services and protocols and methods which are used for protection. On basics of theoretical part is designed model of security infrastructure and it is built in laboratory. Model of security infrastructure is based on Open Source Software and as safety storages for private user authentication data are used cryptographic USB tokens. This master's thesis includes design and construction of real infrastructure of secured elec

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20

Leroux, Bertrand. "La planification spatiale aux prises avec le droit : le travail d'élaboration des schémas de cohérence territoriale." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1115.

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En 2000, la loi Solidarité et Renouvellement Urbains entend relancer la planification supracommunale. Un nouveau dispositif -le schéma de cohérence territoriale- est créé, son objectif : mieux coordonner les initiatives publiques dans le champ de l'aménagement du territoire. Dès 2001 de nombreux groupements de communes s'en saisir. Le parti pris ici est de regarder cette réforme à travers l'activité des chefs de projets de SCOT qui organisent l'écriture de ces documents. De 2002 à 2006, des entretiens documentés ont été conduits auprès de plusieurs responsables administratifs. Cette analyse re

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21

Marček, Ján. "Odposlech moderních šifrovaných protokolů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236427.

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This thesis deals with the introduction to the security mechanism.The procedure explains the basic concepts, principles of cryptography and security of modern protocols and basic principles that are used for information transmission network. The work also describes the most common types of attacks targeting the eavesdropping of communication. The result is a design of the eavesdropping and the implementation of an attack on the secure communication of the SSL protocol..The attacker uses a false certificate and attacks based on poisoning the ARP and DNS tables for this purpose. The thesis discu

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22

von, Wenckstern Michael. "Web applications using the Google Web Toolkit." Master's thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-115009.

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This diploma thesis describes how to create or convert traditional Java programs to desktop-like rich internet applications with the Google Web Toolkit. The Google Web Toolkit is an open source development environment, which translates Java code to browser and device independent HTML and JavaScript. Most of the GWT framework parts, including the Java to JavaScript compiler as well as important security issues of websites will be introduced. The famous Agricola board game will be implemented in the Model-View-Presenter pattern to show that complex user interfaces can be created with the Google

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23

Dias, Paulo de Mendonça. "CERTIFICATE POLYGAMY A MATTER OF TRUST." Master's thesis, 2011. http://hdl.handle.net/10451/13952.

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O acesso a serviços disponíveis na Internet expõe os utilizadores a diversos ataques, tal como o Man-in-the-Middle (MitM). As defesas para estes ataques, tais como autenticação mútua através de uma Public Key Infrastructure (PKI), baseiam-se em infra-estruturas complexas que os utilizadores não estão disponíveis para utilizar e suportar. A enorme aceitação de métodos de autenticação designados por “acto de fé” (leap-of-faith) ou “confiar na primeira utilização” (TOFU, trust-on-first-use), utilizado em implementações comuns de SSH e TLS/SSL, dão sinais claros da pré-disposição dos utilizadores

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24

Smolík, Jiří. "Důvěryhodná proxy v SSL/TLS spojení." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-264815.

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The problem of SSL/TLS interception ("trusted proxy in SSL/TLS connection") has been known for years and many implementations exist. However, all of them share a single technical solution which is based solely on the PKI authentication mechanism and suffers from multiple serious disadvantages. Most importantly, it is not compatible with several aspects or future trends of SSL/TLS and PKI, there's almost no space for improvement and its real use may spawn legal issues. After we analyze technical background and the current solution, we will propose another one, based not only on PKI but SSL/TLS

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Fernandes, Nuno Filipe Trovisco. "Cryptographic library support for a certified compiler." Master's thesis, 2014. http://hdl.handle.net/1822/37511.

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Dissertação de mestrado em Engenharia Informática<br>An essential component regarding the development of information systems is the compiler: a tool responsible for translating high-level language code, like C or Java, into machine code. The issue is, compilers are themselves big and complex programs, making them also vulnerable to failures that may be propagated to the compiled programs. To overcome those risks research on “certified compilers” has been made, and recently some proposals have appeared. That sort of compilers guarantees that the compilation process runs as specified. In t

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