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All Journal Formosa Journal of Computer and Information Science
Muhammad Rifqi Anshory Anshory
Universitas Stikubank
Computer Science & IT

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Performance and Security Analysis of Aes-GCM, Chacha20-Poly1305, and Lightweight-PDAC Algorithms for Securing Exam Links at SMKN 1 Sukoharjo Muhammad Rifqi Anshory Anshory; Eka Ardhianto
Formosa Journal of Computer and Information Science Vol. 5 No. 2 (2026): August 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjcis.v5i2.16926

Abstract

This comprehensive study analyzes the performance and security of three distinct cryptographic algorithms, namely AES-GCM, ChaCha20-Poly1305, and Lightweight-PDAC, for securing Google Forms examination links. A quantitative experimental method combined with a multi-criteria survey mapping (MCDM) was employed using a robust framework encompassing benchmarks (encryption time, decryption time, memory consumption, ciphertext size, and Shannon entropy), OWASP Risk Assessment, and Cost-Benefit Analysis. The final scoring mechanism, which heavily integrated survey weights gathered from 20 diverse respondents including IT teachers, CBT administrators, and IT practitioners, reveals that Lightweight-PDAC achieved the highest final score of 0.9901. In comparison, ChaCha20-Poly1305 and AES-GCM achieved scores of 0.4924 and 0.4620, respectively. These significant findings strongly recommend Lightweight-PDAC as a highly efficient and balanced cryptographic solution for securing examination links, particularly on heterogeneous student devices with limited computational resources.
Co-Authors Eka Ardhianto