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Wednesday, December 5, 2012

Tugas Akhir Penulisan Karya Ilmiah


TUGAS PENULISAN KARYA ILMIAH : PROPOSAL PENGAJUAN PROYEK AKHIR

A. Judul

Perancangan Perangkat Lunak untuk Penyembunyian   Data Digital Menggunakan 4-Least Significant Bit Encoding dan Visual Cryptography "

B. Latar Belakang

Saat ini informasi khususnya gambar telah menjadi aset yang sangat berharga, baik bagi suatu organisasi, perusahaan, pemerintah maupun pribadi. Hal ini menyebabkan informasi menjadi sangat penting untuk dilindungi dari “manipulasi informasi”, pencurian informasi dan serangan terhadap informasi yang secara langsung ataupun tidak langsung akan mempengaruhi kinerja.

Sebuah solusi yang telah diterapkan secara umum terhadap permasalahan tersebut ialah dengan melakukan enkripsi terhadap pesan yang disisipkan pada objek sebelum objek ditransmisikan melalui saluran komunikasi cara ini disebut dengan Kriptografi. Solusi ini bisa jadi membingungkan pihak ketiga yang berhasil mendapatkan objek yang berisi pesan rahasia tersebut untuk sementara waktu. Namun sekali lagi solusi yang ditawarkan ini juga dirasa masih kurang aman. Setelah pihak ketiga berhasil mengetahui algoritma yang digunakan untuk mengenkripsi pesan maka ia dapat melakukan kriptanalisis terhadap pesan tersebut. Solusi lain yang banyak digunakan adalah dengan teknik Steganografi yaitu sebuah teknik menyembunyikan pesan dalam sebuah media. Teknik ini juga memiliki kelemahan yaitu perubahan pada ukuran, format file, waktu terakhir modifikasi, atau dalam pewarnaan kadang kala dapat menunjukkan bahwa media tersebut memiliki sebuah pesan tersembunyi.

Namun, alangkah baiknya jika kedua teknik tersebut dapat digunakan bersama dalam pengamanan sebuah informasi. Penggabungan kriptografi dan steganografi telah dikembangkan untuk meningkatkan keamanan data yang disembunyikan dalam gambar. Metode yang digunakan adalah 4-Least Significant Bit Encoding dan Visual Cryptography. Metode 4-Least Significant Bit Encoding yaitu metode Steganografi yang mengubah empat bit dari media gambar dengan bit dari pesan, sehingga perubahan tidak dapat ditangkap oleh indera manusia. Sedangkan Visual Cryptography merupakan sebuah teknik kriptografi di mana sebuah data berupa gambar atau citra dienkripsi, dengan suatu cara, menjadi sejumlah gambar. Sehingga keamanan suatu data dapat lebih terjamin keamanannya.


  
C. Batasan Masalah

Ruang lingkup permasalahan dalam sistem ini dibatasi oleh beberapa hal sebagai berikut ini :
1.      Penelitian ini hanya membahas proses penyembunyian data, enkripsi dan dekripsi dan pengekstrakan suatu data digital berupa gambar pada media gambar yang memiliki ekstensi BMP, JPG / JPEG, PNG yang mendukung 24 bit depth color dan output dari sistem ini adalah file gambar berekstensi BMP.
2.      Metode yang digunakan adalah 4-Least Significant Bit Encoding untuk teknik penyembunyian pesan dan Visual Cryptography sebagai teknik enkripsi dan dekripsi file.
3.      Ukuran file terbesar yang pernah diujikan pada sistem ini adalah 2,3 MB dengan dimensi 1024 x 819.
4.      Ukuran file cover harus lebih besar daripada ukuran file yang menjadi pesan dalam satuan piksel.
5.      Sistem ini dibuat menggunakan bahasa pemrograman VB.NET.

D. Tujuan

Tujuan yang ingin dicapai dalam pembuatan skripsi ini adalah :  
1.      Merancang sebuah sistem untuk penyembunyian data digital berupa gambar.
2.      Menerapkan gabungan antara metode 4-Least Significant Bit Encoding dan Visual Cryptography dalam sistem



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