الفهرس Only 14 pages are availabe for public view
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Abstract
This thesis addresses one of the important topics in mobile networks, which is Wireless Application Protocol (WAP).
The security of the WAP is based on public-key cryptosystem such as RSA cryptosystem to achieve the authentication between server and client. This cryptosystem suffers from several strong attacks as well as slow decryption process. So, a new public-key cryptosystem named PKQ cryptosystem presented which solve the slowness of the decryption process but still suffers from the same attacks that defeat the RSA cryptosystem such as low exponent attack and common modulus attack.
In this thesis, a modification of the PKQ cryptosystem is proposed which make the PKQ cryptosystem stand against those attacks. It also shows that the decryption time of the modified PKQ cryptosystem is faster than that before.
Then, design of the WAP based on the modified PKQ cryptosystem will be presented to get the optimum authentication between server and client. Finally, it will be shown that the modified PKQ cryptosystem may fit to work in order to optimize the security of WAP.