Algoritma Enkripsi Selektif Citra Digital dalam Ranah Frekuensi Berbasis Permutasi Chaos
<p>This paper presents a selective image encryption in frequency domain. At first, the image is <br />transformed into frequency domain with Discrete Cosine Transform (DCT), and then DCT coefficients are <br />scanned in zigzag, and elements of the low-frequency sub-band are extrac...
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| Format: | Article |
| Language: | English |
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Universitas Syiah Kuala
2015-05-01
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| Series: | Jurnal Rekayasa Elektrika |
| Online Access: | http://www.jurnal.unsyiah.ac.id/JRE/article/view/82 |
| Summary: | <p>This paper presents a selective image encryption in frequency domain. At first, the image is <br />transformed into frequency domain with Discrete Cosine Transform (DCT), and then DCT coefficients are <br />scanned in zigzag, and elements of the low-frequency sub-band are extracted. Encryption is performed only on <br />selected elements by scrambling them using 2D chaos map, namely Arnold Cat Map. Next, IDCT is applied to <br />obtain the encrypted image. The encryption algorithm is included in lossy encryption. Experiments on both <br />grayscale images and color images show that the images can be encrypted succesfully. Histograms of the encrypted <br />images differ significantly from histogram of the original images, and the pixels in the encrypted images are not <br />longer correlated.</p> |
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| ISSN: | 1412-4785 2252-620X |