Date of Submission

7-2025

Date of Award

7-2025

Institute Name (Publisher)

Indian Statistical Institute

Document Type

Master's Dissertation

Degree Name

Master of Technology

Subject Name

Cryptology

Department

Cryptology and Security Research Unit (CSRU-Kolkata)

Supervisor

Preneel, Bart

Co-Supervisor (if any)

Roy, Bimal Kumar

Abstract (Summary of the Work)

The growing usage of the Internet of Things (IoT) has made it necessary to ensure

the security of these interconnected devices. Key management becomes particularly

challenging when devices are not always online due to resource constraints or business

decisions. Moreover, the IoT infrastructure typically relies on the publish-subscribe

model for communication, which raises additional security considerations since the

message broker becomes a central point of attack. Existing solutions with end-toend

encryption from publisher to subscriber are either computationally expensive for

resource constrained devices or compromise on the decoupling in publish/subscribe

systems. This thesis tackles the problem of efficient key management in IoT systems

by employing techniques from broadcast encryption and proposes a lightweight

framework - TKBE (Two Key Broadcast Encryption) that reduces trust in the broker

and enhances security in IoT communications while providing efficient immediate

revocation with decoupling and offline key updates.

Comments

System generated keywords

Control Number

2021-23

DOI

https://dspace.isical.ac.in/items/f8d217e9-29a1-4ce3-a8c7-3bc7da913e38/full

DSpace Identifier

http://hdl.handle.net/10263/7667

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