fix spelling

cw/cw.tex

@@ -201,6 +201,30 @@
 		a = \frac{s' - s}{h - h'}
 	$$
 
+	\subsection{6.2}
+	\subsubsection{6.2.1}
+		To sign a contract $C$ Alice first chooses 2 random values $r$ and $c_2$ then $z$ is callulated $z=g^r\times y_b^{c_2}$. After we have $z$ we can calculate the intermidary value $c$, $c = H(y_a, y_b, C, z)$. After having $c$ we calculate $c_1$, $c_1 = c - c_2$. $c_1$ is then used to callulate $s = r - c1 \times a mod q$. The signature is $(c_1, c_2, s)$
+	\subsubsection{6.2.2}
+	No because Alice only needs Bob's public key which is publicly avaiable
+	\subsubsection{6.2.3}
+	The signature is verified if the equation holds
+	$$c_1 + c_2 = H(y_a, y_b, C, g^s\times y_a^{c_1} \times y_b^{c_2} mod p )$$
+	\subsubsection{6.2.4}
+	No because the signature is generated from multiple public keys and Alice's private key therefore chris will not be able to tell who signed the contract
+
+	\subsection*{6.3}
+	\subsubsection*{6.3.1}
+	The encryption works because the numbers that were chosen by Alice and Bo b  make this equation work
+	$$(m^{r_a})^{r_b} = m$$
+
+	which means that
+
+	$$((((m^{r_{a\text{ alice}}})^{r_{a\text{ bob}}})^{r_{b\text{ alice}}})^{r_{b\text{ bob}}}) = m$$
+
+	in this case $r_a$ from alice cancels $r_b$ from alice, and $r_a$ from bob cancels $r_b$ from bob
+	\subsubsection*{6.3.2}
+	
+
 	\section*{7}
 	\subsection*{7.1}
 	$$v1 = (137, 312), v2 = (215, -187)$$