Adnan Abdul-Aziz Gutub* and Ahmed Ali Al-Nazer

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Presentation transcript:

Adnan Abdul-Aziz Gutub* and Ahmed Ali Al-Nazer MAXIMIZING STEGANOGRAPHY CAPACITY USING “KASHIDA” IN ARABIC TEXT (MSCUKAT) Adnan Abdul-Aziz Gutub* and Ahmed Ali Al-Nazer Computer Engineering Department King Fahd University of Petroleum & Minerals (KFUPM) Dhahran 31261, Saudi Arabia Report：Chun-Cheng Wang 2009/10/24

Outline INTRODUCTION BACKGROUND PROPOSED APPROACH IMPROVEMENTS EXPERIMENTS AND COMPARISONS SECURED MSCUKAT FUTURE WORK CONCLUSION

INTRODUCTION Hiding secret information in text is more challenging. Arabic characters are joined when writing words contain more than one character. Depending on the joined characters, an extension character “Kashida” may be embedded between two Arabic characters.

BACKGROUND

When the letter Lam is followed directly by four formats of the letter Alif , they are written in well known look: We exclude “Kashida” to come between those letters.

PROPOSED APPROACH

IMPROVEMENTS First, the capacity of cover media is increased to hide more secret information. Second, the file size increase after hiding the secret is reduced since we have less addition to the original cover media. Third, the security of the encoded cover media is enhanced.

EXPERIMENTS AND COMPARISONS P: the ratio of the applicable locations to hide 1s to the cover media length. Q: ration of the applicable locations to hide 0s to the cover media length.

Number of char is the number of first characters in the cover media that can hide the secret. Cover percentage is Number of char/Cover media length * 100; this gives the percentage of cover media that have been used to hide the secret. Secret ratio is the ratio between secret and cover media which equals to secret length/Number of char.

SECURED MSCUKAT

Skip-number = modular (cover-media-size, 5) Modular (current-location, skip-number) For example, if skip-number is 3, it means that it will hide the secret in all possible location for “Kashida” but it will skip the third possible from each five possible locations.

CONCLUSION The proposed approach is maximizing the use of “Kashida” to hide more information in Arabic text cover media. The improvements include increasing the capacity of cover media to hide more secret information, reducing the file size increase after hiding the secret and enhancing the security of the encoded cover media.