Formosa Journal of Computer and Information Science
Vol. 5 No. 2 (2026): August 2026

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 (Universitas Stikubank)
Eka Ardhianto (Universitas Stikubank)



Article Info

Publish Date
27 Aug 2026

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.

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Journal Info

Abbrev

fjcis

Publisher

Subject

Computer Science & IT

Description

Formosa Journal of Computer and Information Science (FJCIS) is an international platform for scientists, academics, practitioners and engineers involved in all aspects of computer science and information sciences to publish high quality, up todate, peer review papers. It is an international research ...