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" Lightweight Multi-Recipient Asymmetric Cryptographic Scheme and Multicast-Based Key Management Protocols for VANETs "
Mansour, Ahmad Abd-Allah Ahmad
Malik, Khalid Mahmood
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1052921
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| Doc. No
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TL52038
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| Main Entry
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Mansour, Ahmad Abd-Allah Ahmad
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| Title & Author
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Lightweight Multi-Recipient Asymmetric Cryptographic Scheme and Multicast-Based Key Management Protocols for VANETs\ Mansour, Ahmad Abd-Allah AhmadMalik, Khalid Mahmood
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| College
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Oakland University
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| Date
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2019
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| Degree
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Ph.D.
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2019
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| Note
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140 p.
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| Abstract
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Vehicular ad hoc networks (VANETs) were initially designed to assist in traffic management and delivery of safety messages. Due to the significant evolution in modern vehicles, the features offered by VANETs have expanded to include comfort and entertainment relevant services. This expansion has further increased the need to secure them. Multi-recipient cryptographic schemes provide secure communication, between one sender and multiple recipients, in a multi-party group. Securing multi-party communication is very challenging, particularly in dynamic networks. Existing multi-recipient cryptographic schemes pose a variety of limitations. These include: requiring trust among all recipients to make an agreement, high computational cost for both encryption and decryption, and additional communication overhead when the membership in group changes. In order to overcome these limitations, this research introduces a novel multi-recipient asymmetric cryptographic scheme, AMOUN. The proposed scheme enables the sender to possibly send different messages in one ciphertext to multiple recipients, to better utilize network resources, where each recipient only retrieves its own designated message. Security analysis demonstrates that the proposed scheme is indistinguishable under adaptive chosen plaintext attack. Evaluation results demonstrate that lightweight AMOUN outperforms RSA and Multi-RSA, in terms of computational cost, for both encryption and decryption, even when the key sizes are four times larger than ones used for RSA and Multi-RSA. For a given prime size, in case of encryption, AMOUN shows 98% and 99% lower average computational cost than RSA and Multi-RSA, respectively; while for decryption, it shows a performance improvement of 99% compared to RSA and Multi-RSA. The security of VANETs is mainly dependent on sharing a cryptographic group key confidentially. Due to the frequent change in group membership, there is a need to update the group key repeatedly, which is difficult in highly dynamic networks like VANETs. Therefore, designing a secure, scalable, and efficient group key management protocol is challenging. Existing group key management protocols introduce a variety of limitations, including high computational cost for both group key computation and retrieval, additional computational and communication overhead when the membership in the group changes, and collusion among receiving vehicles. To overcome these limitations, this research introduces a novel group key management protocol, ALMS. Performance analysis reveals that, compared to existing protocols, ALMS is more scalable since it introduces a low computational overhead for both the Trusted Authority (TA) and the receiving vehicles. Also, it does not suffer from the key distribution limitation as symmetric key management protocols do. Moreover, ALMS introduces only a light overhead on the TA for group membership change. This is achieved by decoupling the initialization from group key computation and performing it offline without affecting the size of the encrypted group key. To further improve the scalability of ALMS, this research proposes a hierarchical group key management protocol, h-ALMS, which significantly reduces the computational and communication overhead on both the TA and group members.
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| Descriptor
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Computer science
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Malik, Khalid Mahmood
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Oakland University
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