An Enhanced Hybrid Method Using AES Algorithm And Arabic Text Steganography
Cryptography and steganography are the most common methods for ciphering and hiding data, respectively. Cryptography is a technique uses mathematics to encrypt and decrypt data, where the data is converted into some other gibberish form, and then the encrypted data is transmitted. However, crypto...
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| Format: | Thesis |
| Language: | English |
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| Summary: | Cryptography and steganography are the most common methods for ciphering and hiding
data, respectively. Cryptography is a technique uses mathematics to encrypt and decrypt
data, where the data is converted into some other gibberish form, and then the encrypted
data is transmitted. However, cryptography alone cannot guarantee that the data will be
entirely secured because the scrambled message is still visible to the eavesdropper. On the
other hand, steganography is the art and science of hiding conununication. Therefore, a
stenographic system embeds hidden content in the unremarkable cover media such as text
to avoid an eavesdropper's suspicion. Existing methods are still lacking in capacity and
security. Hence, an enhanced hybrid method using existing Advanced Encryption
Standard (AES) algorithm and new Arabic text steganography based on concept of lunar
and solar letters is proposed. AES algorithm is chosen because symmetric encryption
algorithm runs faster and performs better in smaller scale applications as compared to
Asymmetric key algorithms. In addition, the memory requirement of Symmetric
algorithm is lesser as compared to asymmetric. Five variations of text steganography
methods namely Method A, Method B, Method C, Method D and Method E that consist
of 28 Arabic letters classified into 14 solar letters and 14 lunar letters are proposed.
Evaluation on capacity and security against three related existing methods were carried
out. Capacity is evaluated using embedding ratio and efficiency ratio while security is
evaluated using invisibility test. Invisibility test is carried out using a survey on random
100 Iraqi computer science students. Method A produces the highest embedding ratio
84.26% and the highest efficiency ratio 70.13%. In addition, method A produces the
highest security with results of 100% from the invisibility survey when compared with
four proposed and three existing methods. It is concluded that method A outweighs other
methods in terms of capacity and security. |
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