GDL

Lossless Image Cryptography Algorithm Based on Discrete Cosine Transform

2011
Journal from gdlhub / 2017-08-14 11:52:31
Oleh : Sara Tedmori, Nijad Al-Najdawi, IAJIT
Dibuat : 2012-06-22, dengan 1 file

Keyword : Image cryptography, image encryption and decryption, and frequency domain coefficients.
Subjek : Lossless Image Cryptography Algorithm Based on Discrete Cosine Transform
Url : http://www.ccis2k.org/iajit/PDF/vol.9,no.5/3007-11.pdf
Sumber pengambilan dokumen : Internet

The science of cryptography has recently attracted significant attention, as progressively more information is stored


and transmitted in electronic form. Cryptography is the discipline of using codes to encrypt data into an unreadable format


that only the targeted recipients can decrypt and read. Encryption methods can be divided into two categories: lossy and


lossless. In lossy encryption methods, the decrypted image details are vulnerable to distortion. Lossless encryption methods


are more relevant when marginal distortion is not tolerable. In this research, the authors propose a novel lossless


encryption/decryption technique. In the proposed algorithm, the image is transformed into the frequency domain, where low


and high frequencies are processed in a way that guarantees a secure, reliable, and an unbreakable form. The encryption


algorithm uses the discrete cosine transform to convert the target image into the frequency domain, after which the encryption


involves scattering the distinguishable DC value using a reversible weighting factor amongst the rest of the frequencies. The


algorithm is designed to shuffle and reverse the sign of each frequency in the transformed block before the image blocks are


transformed back to the pixel domain. The results show a total change in the encrypted image pixel values, concealing the


image details. The decryption algorithm reverses the encryption steps and returns the image to its original form without any


loss in the pixel values. Based on the application’s requirements, .the decryption algorithm can perform with or without a


decryption key, The encryption algorithm is suitable for applications that require secure transport of high quality data.

Deskripsi Alternatif :

The science of cryptography has recently attracted significant attention, as progressively more information is stored


and transmitted in electronic form. Cryptography is the discipline of using codes to encrypt data into an unreadable format


that only the targeted recipients can decrypt and read. Encryption methods can be divided into two categories: lossy and


lossless. In lossy encryption methods, the decrypted image details are vulnerable to distortion. Lossless encryption methods


are more relevant when marginal distortion is not tolerable. In this research, the authors propose a novel lossless


encryption/decryption technique. In the proposed algorithm, the image is transformed into the frequency domain, where low


and high frequencies are processed in a way that guarantees a secure, reliable, and an unbreakable form. The encryption


algorithm uses the discrete cosine transform to convert the target image into the frequency domain, after which the encryption


involves scattering the distinguishable DC value using a reversible weighting factor amongst the rest of the frequencies. The


algorithm is designed to shuffle and reverse the sign of each frequency in the transformed block before the image blocks are


transformed back to the pixel domain. The results show a total change in the encrypted image pixel values, concealing the


image details. The decryption algorithm reverses the encryption steps and returns the image to its original form without any


loss in the pixel values. Based on the application’s requirements, .the decryption algorithm can perform with or without a


decryption key, The encryption algorithm is suitable for applications that require secure transport of high quality data.

Beri Komentar ?#(0) | Bookmark

Properti	Nilai Properti
ID Publisher	gdlhub
Organisasi	IAJIT
Nama Kontak	Herti Yani, S.Kom
Alamat	Jln. Jenderal Sudirman
Kota	Jambi
Daerah	Jambi
Negara	Indonesia
Telepon	0741-35095
Fax	0741-35093
E-mail Administrator	elibrarystikom@gmail.com
E-mail CKO	elibrarystikom@gmail.com