PENGEMBANGAN PERANGKAT LUNAK PENYEMBUNYIAN PESAN TERENKRIPSI MENGGUNAKAN ALGORITMA MARS PADA CITRA DIGITAL DENGAN METODE ADAPTIF
Abstract: Steganography and
cryptography are security method of secret message from third party who curious
to see it. Steganography secures the message by hiding it on digital media.
While for cryptography, it secures the message by coding it so the message will
be understandable only by the message sender and the receiver. In this
research, the secret text message shall be encrypted first by using MARS
cryptography algorithm, then it’ll be embedded on bitmap extended grayscale
image digital media with adaptive steganography method. Adaptive steganography
method consisted of three phases: capacity assessment, minimum error
replacement (MER) and false contouring. While MARS cryptography algorithm also
has three phases: forward mixing, cryptographic core and backward mixing. After
being implemented into the program, the resulted stego-images were assessed
subjectively by sharing questionnaires, where out of 33 respondents 72% said
that before and after embedded, the images don’t have any differences from its
brightness, 48% from its noise, and 67% couldn’t choose which one stego-image
is. The objective assessment was done by calculating the value of Root Mean
Square Error (RMSE) and Peak Signal to Noise Rational (PSNR), where out of 8
tested stego-images had low RMSE and the PSNR were above 30dB. From both
assessment, it’s concluded that the resulted stego-images had good quality (no
changement significantly).
Penulis: Dewi Sartika
Kode Jurnal: jptinformatikadd160959
