A Secure and Efficient Hybrid Cryptographic Framework for Mobile Cloud Systems Using ChaCha20 and Elliptic Curve Cryptography

Gunda, Vinay (2025) A Secure and Efficient Hybrid Cryptographic Framework for Mobile Cloud Systems Using ChaCha20 and Elliptic Curve Cryptography. Masters thesis, Dublin, National College of Ireland.

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Abstract

In the era of digital mobility, securing data transmission between mobile devices and cloud platforms has become a critical challenge. Cryptography plays a key role in ensuring confidentiality, integrity, and authenticity of sensitive information. Traditional models, such as RSA-AES combinations, often suffer from high computational overhead, increased latency, and inefficiency on resource-constrained devices, making them less suitable for real-time mobile cloud environments. To overcome these limitations, this study proposes a novel hybrid cryptographic framework combining Elliptic Curve Cryptography (ECC) for lightweight key exchange and ChaCha20, a stream cipher known for its speed and security, for data encryption. The system is implemented using an ASP.NET Core backend on Microsoft Azure, with secure storage in Azure SQL Database, offering a cloud-native architecture for encrypted data transmission and storage. The model is evaluated using JPG, PDF, and DOC files of varying sizes. Results show encryption times increase linearly with size, while decryption remains fast. The system achieved a peak throughput of 7.24 MB/s. These findings demonstrate that the ChaCha20-ECC hybrid model ensures high performance, scalability, and strong encryption, making it ideal for secure, real-time communication in modern mobile cloud applications.

Item Type:	Thesis (Masters)
Supervisors:	Name Email Arun, Shreyas Setlur UNSPECIFIED
Uncontrolled Keywords:	Hybrid Encryption; ChaCha20; Elliptic Curve Cryptography (ECC); Mobile Cloud Security; Secure Data Transmission
Subjects:	T Technology > T Technology (General) > Information Technology > Cloud computing Q Science > QA Mathematics > Computer software > Computer Security T Technology > T Technology (General) > Information Technology > Computer software > Computer Security
Divisions:	School of Computing > Master of Science in Cloud Computing
Depositing User:	Ciara O'Brien
Date Deposited:	26 Mar 2026 09:53
Last Modified:	26 Mar 2026 09:53
URI:	https://norma.ncirl.ie/id/eprint/9218

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