PERANCANGAN SISTEM ENKRIPSI AUDIO MENGGUNAKAN ALGORITMA EL GAMAL UNTUK MENINGKATKAN PERTUKARAN FILE AUDIO
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Abstract
Security in multimedia data transmission, particularly audio, faces significant challenges regarding key distribution vulnerabilities in conventional symmetric algorithms. This study aims to design a WAV digital audio encryption system using the El-Gamal asymmetric algorithm based on the Discrete Logarithm Problem (DLP) to ensure data confidentiality without private key exchange. The research method involves transforming audio sample domains from signed to unsigned integers, applying probabilistic encryption functions, and quantitative testing. System performance evaluation is measured using Signal-to-Noise Ratio (SNR) parameters, histogram analysis, and correlation coefficients. Test results indicate that the system successfully converts original sound into unrecognizable noise with an SNR reaching -18.4 dB and a correlation coefficient near zero (0.0021), signaling the loss of linear data relationships. Histogram analysis reveals a distribution shift from Gaussian patterns to uniform, indicating high entropy and resistance to statistical attacks. Despite a twofold file size expansion, the El-Gamal algorithm proves to provide superior confidentiality and lossless data integrity compared to classical substitution methods.
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