PENYANDIAN CITRA MENGGUNAKAN METODE PLAYFAIR CIPHER

Publication Type:

Journal Article

Source:

Jurnal Teknologi IST AKPRIND, Volume 2, Number 2 (2009)

Keywords:

cipherteks, image, kriptanalisis, plainteks, playfair cipher

Abstract:

Playfair Cipher is one of the methods which is classified as classic kriptogafi encryption
process using the processing in the form of large blocks. This method is one way to overcome the
weaknesses of other classical cryptographic methods which are easily predictable because there is
one-one correspondence between plainteks with cipherteks. Just as in text messages confidential,
messages also require image techniques encryption as simple as possible, but difficult to solve .
The process of securing the message in the form of images can be done by encrypting the image
into another image in a particular algorithm. This is possible since an image can be represented in
a matrix that contains the integers. In this study Playfair Cipher will be implemented to encrypt the
image with 24 bits bmp format, which has a size of 256 x 256 pixels. The image to be tested
consists of 2 types of images which are images with different contrast levels and image with a
category different levels of detail. The key used to encrypt the image is by using a matrix of type 2
has order 16 x 16.
From the test results obtained that Playfair cipher is a classic method that suitable for the
image with good quality and the image with the image category detail. This can be seen from the
randomness of the image color intensity that has been encoded. Also because of the key matrics
used size large enough to cause kriptanalisis takes long enough to find the key matrix, because
there are 256! Likely form a key matrix.

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(c) 2009 Jurnal teknologi FTI IST AKPRIND
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