PENERAPAN ALGORITMA AFFINE CIPHER DAN REED–SOLOMON CODE UNTUK PENGAMANAN DAN PEMULIHAN DATA PADA CITRA DIGITAL
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Abstrak
Pertukaran data citra digital pada jaringan publik memiliki kerentanan ganda, yaitu risiko penyadapan dan kerusakan data akibat gangguan sinyal (noise). Enkripsi konvensional seringkali hanya menangani aspek kerahasiaan (confidentiality) tanpa mekanisme pemulihan jika data terenkripsi rusak. Penelitian ini mengusulkan sistem hibrida yang mengintegrasikan Affine Cipher untuk enkripsi dan Reed-Solomon Code untuk proteksi integritas. Citra digital dienkripsi menggunakan fungsi substitusi linier, kemudian diproses dengan encoder Reed-Solomon untuk menyisipkan parity byte. Hasil pengujian menunjukkan bahwa metode yang diusulkan mampu mengamankan informasi visual citra dan memulihkan citra asli kembali ke kondisi utuh (lossless) meskipun data terenkripsi mengalami noise atau kerusakan bit hingga batas toleransi tertentu. Kombinasi ini memberikan solusi keamanan yang efektif menjamin kerahasiaan sekaligus ketersediaan data (availability) pada transmisi citra.
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Referensi
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