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SSL technology encrypts communication between a client and a website. Although it slows performance, it s often used when private or sensitive information needs to be transmitted between an authenticated user and a web application. Without SSL, any information that s sent over the Internet, including passwords, credit card numbers, and employee lists, is easily viewable to an eavesdropper with the right network equipment. Even with the best encryption, you have another problem to wrestle with just how can a client be sure a web server is who it claims to be For example, consider a clever attacker who uses some sort of IP spoofing to masquerade as Amazon.com. Even if you use SSL to transfer your credit card information, the malicious web server on the other end will still be able to

Notice that the associated post shows up in the $this->data['Post'] array (lines 11 27 of Listing 14-14) because of the hasAndBelongsToMany association already set up in the Post and Tag models. This array would be much larger if more posts were associated with the current tag, but Listing 14-14 at least shows how $this->data will contain these associated records. What I m looking for in this array, however, is not the associated posts but the parent_id field. So, since I already selected a parent node from the Parent Tag select menu and saved the tag, $this->data shows that the value was saved properly; line 6 of Listing 14-14 shows that the ID value of 2 is now saved in the parent_id field for this current record. Now that the Parent Tag select menu is working in the Edit view and saving the selected value in the parent_id field, paste the same line of Form helper code into the Add view file: echo $form->input('parent_id',array('label'=>'Parent Tag','type'=>'select', 'options'=>$tags,'empty'=>'- No Parent Tag -'));

decrypt all your information seamlessly. To prevent this type of deception, SSL uses certificates. The certificate establishes the identity, and SSL protects the communication. If a malicious user abuses a certificate, the certificate authority can revoke it. To use SSL, you need to install a valid certificate. You can then set IIS directory settings specifying that individual folders require an SSL connection. To access this page over SSL, the client simply types the URL with a preceding https instead of http at the beginning of the request. In your ASP.NET code, you can check whether a user is connecting over a secure connection using code like this: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load If Request.IsSecureConnection Then lblStatus.Text = "This page is running under SSL." Else lblStatus.Text = "This page isn't secure.<br />" lblStatus.Text &= "Please request it with the " lblStatus.Text &= "prefix https:// instead of http://" End If End Sub

Figure 1-8. Goal seeking for the algebraic equation math problem You will goal seek for several variables to produce a desired answer. But first, let s review how this equation works. Take the algebra expression ax + by + cz = d. In this expression, you can substitute all of the values a, b, c, d, x, y, and z, except for one value. Given six of the values, you can determine the seventh value.

With SSL, the client and web server start a secure session before they communicate any information. This secure session uses a randomly generated encryption key. Here s how the process works: 1. The client requests an SSL connection. 2. The server signs its digital certificate and sends it to the client. 3. The client verifies the certificate was issued by a certificate authority it trusts, matches the web server it wants to communicate with, and has not expired or been revoked. If the certificate is valid, the client continues to the next step. 4. The client tells the server what encryption key sizes it supports. 5. The server chooses the strongest key length that is supported by both the client and server. It then informs the client what size this is. 6. The client generates a session key (a random string of bytes). It encrypts this session key using the server s public key (which was provided through the server s digital certificate). It then sends this encrypted package to the server. 7. The server decrypts the session key using its private key. Both the client and server now have the same random session key, which they can use to encrypt communication for the duration of the session.