ComputerSecurity/secondcw/cw/cw.tex

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% Write the approved title of your dissertation
\title{Automated image classification with expandable models}

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\author{Andre Henriques, 6644818}

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\begin{document}
	\section*{1}
	\subsection*{1.1}
		The file ag01598\_6644818\_1.1.spdl contains the base model of $\text{protocol}\Pi$.

		I choose the names of the roles based on their functions since it would make the file more readable so R is Phone, S is Application, N is Network.

		As the diagram shows the first message is sent from the phone do the network to request the generation of a new session key.

		The keys where modeled using a custom usertype called ``SessionKey'' and the time to live has modeled using a custom usertype called ``Timestamp''

		The Network then aswers to the Phone and the Application the keys and the time to live and the hashed value of that using a hash function named ``Mac''.

		The Phone and the Application verify the Mac and then the phone sends a nonce to the phone and the phone answers back with a new nonce and the original nonce.
	

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