|
|
Privacy-Enhancing Technologies and Privacy-Enhancing Cryptography for Wearables
Casanova-Marqués, Raúl ; Pendo,, Cristiano Gonçalves (oponent) ; PhD, Lukasz Michal Chmielewski, (oponent) ; Hajný, Jan (vedoucí práce)
The increasing concern surrounding privacy and the safeguarding of digital identities has emphasized the pressing necessity of establishing secure and confidential communication channels. This concern has led to the development of cryptographic mechanisms aimed at facilitating impervious information exchange. Nevertheless, traditional cryptographic approaches are proving insufficient in dynamic and resource-constrained environments, such as wearable devices. As a result, attribute-based credential schemes have emerged as a promising solution, offering fine-grained access control to digital services based on user-specific attributes. This doctoral thesis examines the efficacy and scalability of attribute-based anonymous credential schemes in ensuring the authenticity and security of users within dynamic architectures of wearable devices. It also explores enhancements to these schemes, with a primary focus on incorporating user revocation while maintaining privacy. Additionally, the thesis presents devised mechanisms to enable attribute-based authentication protocols on smart cards with limited support for elliptic curve cryptography. It addresses specific challenges associated with the usability of smart cards. Moreover, the thesis investigates the integration of anonymous authentication schemes in collaborative indoor positioning systems, aiming to provide privacy and security. Lastly, it explores the implementation of attribute-based authentication schemes in resource-constrained environments, with an emphasis on Internet of Things devices, and evaluates their feasibility within the dynamic architectures of wearable devices. The first contribution of this thesis introduces a purposefully designed protocol for anonymous authentication on smart cards. This protocol combines attribute-based credentials and user revocation while ensuring computational efficiency. To facilitate effective implementation and evaluation, the thesis employs smart cards equipped with the MULTOS operating system. The second contribution focuses on optimizing the capabilities of smart cards using Java Card technology for the implementation of attribute-based credential schemes. These smart cards are presented as a more accessible alternative for a wider consumer base. To overcome limitations in their application programming interface, the thesis devises strategies to augment the constrained support for elliptic curve cryptography and effectively implement such schemes. The third contribution presents the Privacy-Enhancing Authentication System, a robust solution compatible with smart cards, smartphones, and smartwatches. This system addresses the functional challenges associated with smart cards, including the absence of a graphical interface and limited user control over attribute disclosure. Consequently, it offers a practical and deployable solution for real-world scenarios. Finally, the thesis proposes a groundbreaking scheme to safeguard collaborative indoor positioning systems by addressing both privacy and security concerns. This scheme ensures the preservation of privacy and security by eliminating centralized architectures and employing encryption techniques for positioning information. The thesis includes comprehensive details such as protocol use cases, implementation specifics, execution benchmarks, and a comparative analysis with existing protocols.
|
|
|
Hiding and obfuscation of malware to avoid antivirus detection
Rybár, Matej ; Dzurenda, Petr (oponent) ; Casanova-Marqués, Raúl (vedoucí práce)
During security assessments, it is fairly uncommon for someone to be persuaded that antivirus software does not provide total security. When a penetration tester comes across antivirus software, there are times when he or she must act quickly. For these and other reasons, a variety of methods for getting around antivirus software have been devised. Some of these obfuscation approaches aim to escape static analysis by modifying and manipulating the Portable Executable file format, which is a standardized Windows executable file format. Several types of malware change the PE file format to avoid static antivirus detection. This thesis delves into the PE file format, malware detection, and static detection of obfuscation techniques. This thesis's result is a scantime crypter Persesutor, which encrypts the input file and then decrypts and loads the encrypted file into memory after execution.
|
|
|
Readiness of Anonymous Credentials for Real Environment Deployment
Casanova-Marqués, Raúl ; Dzurenda, Petr
Attribute-based Credentials (ABCs) are a promising technology for protecting users' privacy and digital identity. We can use ABCs in a multitude of contexts. For instance, we can prove the validity of transportation tickets, demonstrate the legal age, prove the health status, or prove access rights in the company environment. All of this, we can do without disclosing complete personal identity. Nevertheless, ABCs generally require computational power that some wearable devices cannot cope with. In this paper, we present our implementation of a privacy-enhancing authentication system based on ABCs technology. The system is suitable for deployment in real-world scenarios and uses a wide range of differently powerful user devices (e.g., smart cards, smartphones, and wearables). Based on our implementation results, we also discuss the implementations aspects of ABCs, their readiness, and usability in real-world applications.
|
|
|
Hiding and obfuscation of malware to avoid antivirus detection
Rybár, Matej ; Dzurenda, Petr (oponent) ; Casanova-Marqués, Raúl (vedoucí práce)
During security assessments, it is fairly uncommon for someone to be persuaded that antivirus software does not provide total security. When a penetration tester comes across antivirus software, there are times when he or she must act quickly. For these and other reasons, a variety of methods for getting around antivirus software have been devised. Some of these obfuscation approaches aim to escape static analysis by modifying and manipulating the Portable Executable file format, which is a standardized Windows executable file format. Several types of malware change the PE file format to avoid static antivirus detection. This thesis delves into the PE file format, malware detection, and static detection of obfuscation techniques. This thesis's result is a scantime crypter Persesutor, which encrypts the input file and then decrypts and loads the encrypted file into memory after execution.
|
host ::
RSS.