Reboot based framework for high-threshold cryptosystem
Agarwala, Disha
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Permalink
https://hdl.handle.net/2142/113214
Description
Title
Reboot based framework for high-threshold cryptosystem
Author(s)
Agarwala, Disha
Issue Date
2021-07-19
Director of Research (if dissertation) or Advisor (if thesis)
Mohan, Sibin
Department of Study
Computer Science
Discipline
Computer Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
High threshold cryptosystem
Mobile adversaries
Proactive Secret Sharing
Security
Abstract
Threshold cryptosystems eliminate a single point of failure by distributing the root of trust in applications like key management-as-a-service, signature schemes and encrypted data storage. However, existing threshold cryptosystems do not ensure availability when a malicious adversary corrupts more than half of the devices in the network.
We present High Threshold Cryptosystem (HiTC), an iterative reboot-based framework for threshold cryptosystem that is resilient against a malicious mobile adversary that can corrupt up to all but one device in the network. With a careful design of rebooting devices, HiTC ensures that a sufficient number of honest devices are always available in the network to ensure that the system as a whole is always available. We also design a novel and efficient resharing protocol to protect secrets in the presence of a strong mobile adversary. We assess our security assumptions through case studies of real-world attacks and extensive measurements. We implement HiTC atop a distributed symmetric key encryption system and evaluate it using up to 18 AWS EC2 instances and up to 6 Raspberry Pis. Our evaluation using AWS EC2 instances demonstrates that HiTC is practical and incurs an average overhead of 20% over the baseline. Furthermore, the Raspberry pi setup performs poorly, but preliminary results prove that enhancement in implementation can help achieve better performance.
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