ALGORITMA MEoF (MODIFIKASI END of FILE) UNTUK STEGANOGRAFI PADA CITRA BITMAP 24 BIT; MEoF ALGORITHM (MODIFICATION END of FILE) FOR STEGANOGRAPHY ON 24-BIT BITMAP IMAGE

Tarigan, Thomas Edyson, Edi Winarko

2015 | Disertasi | FMIPA

Information in the form of messages, can be encoded and inserted into digital media. Techniques to hide or insert the message is called steganography. Steganography is the art and science of hiding information so that confidential information can not be known by others, except the sender and the recipient. Many ways have been made to secure information from parties who are not responsible, one of which did stegano using End of File (EoF) algorithms utilize bitmap image as a container for messages. EoF message insertion algorithm made after the end Byte of bitmap image, but the resulting stego file using EoF algorithm still has weaknesses, which is the increase in file size and appearance of an extra line on the bottom line stego image. Visually downside of stego file generated by using EoF algorithms is on the quality of the visible image. This study aims to modify the EoF algorithm message insertion utilizes a 24-bit bitmap image as a digital media to accommodate the message. Modification of the technique lies in the insert message, modifications carried out by inserting the message on the bitmap image padding. Padding is empty Byte storage device that has been used by the file yet Byte storage space is not used entirely for storing image data. The message that will be inserted is the ASCII character that has been encrypted using the Rijndael algorithm. Results EoF algorithm modifications hereinafter referred to MEoF algorithm (Modification End of File). Qualitative test results showed the insertion of messages with MEoF and MLSB algorithms visualy the image quality still looks like the original image. While the image quality using EoF algorithm changes. Quantitative test results showed that the noise generated by MEoF algorithm is better than the algorithm EoF, but not always better than MLSB. In addition to the condition that not dominant image Byte MEoF algorithm capable of inserting a message bigger than MLSB.

Kata Kunci : Algorithm MEoF; Padding; Stego Image