Cryptosystems for Secure and Efficient Cloud Services
From Key Management, Secure Computing, and Search Functionality
Huanhuan Chen (TU Delft - Cyber Security)
Reginald Lagendijk – Promotor (TU Delft - Cyber Security)
K. Liang – Copromotor (TU Delft - Cyber Security)
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Abstract
Big data is generated daily from diverse sources and devices, significantly transforming our lives through machine learning. However, it also presents major challenges, particularly for individuals and organizations with limited storage and computational resources. As a result, cloud services have gained increasing popularity over the past decades, enabling users to outsource storage and complex analysis tasks while focusing on data utilization. However, due to the potential curiosity of cloud servers and external attackers, directly uploading private data to the cloud is not a viable option. Instead, sensitive data must be encrypted before being outsourced.
This thesis investigates cryptographic solutions for secure and efficient cloud services, addressing key challenges in security, efficiency, and functionality. We focus on three core areas: updatable encryption (UE) to ensure long-termsecurity for stored data, fully homomorphic encryption (FHE) for efficient computation over encrypted data, and searchable encryption (SE) to maintain search functionality over outsourced encrypted data....