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An important principle of asymmetric encryption is that you can t determine a private key by analyzing the corresponding public key To do so would be computationally expensive (even more difficult than cracking one of the encrypted messages) However, asymmetric encryption also has its limitations namely, it s much slower and generates much larger messages than symmetric encryption Symmetric encryption is the type of encryption that most people are intuitively familiar with It uses the same secret key to encrypt a message as to decrypt it The drawback with symmetric encryption is that both parties need to know the secret value in order to have a conversation However, you can t transmit this information over the Internet, because a malicious user might intercept it and then be able to decipher the following encrypted conversation The great trick of SSL is to combine asymmetric and symmetric encryption.

The membership API is just used for managing and authenticating users. It does not implement any authorization functionality and doesn t provide you with functionality for managing user roles. For this purpose, you have to use the roles API. You will learn more about authorization and the role management functionality in 23.

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The ExecuteNonQuery() method executes commands that don t return a result set, such as INSERT, DELETE, and UPDATE. The ExecuteNonQuery() method returns a single piece of information the number of affected records. Here s an example that uses a DELETE command by dynamically building a SQL string: SqlConnection con = new SqlConnection(connectionString); string sql = "DELETE FROM Employees WHERE EmployeeID = " + empID.ToString(); SqlCommand cmd = new SqlCommand(sql, con); try { con.Open(); int numAff = cmd.ExecuteNonQuery(); HtmlContent.Text += string.Format("<br />Deleted <b>{0}</b> record(s)<br />", numAff); } catch (SqlException exc) { HtmlContent.Text += string.Format("<b>Error:</b> {0}<br /><br />", exc.Message); } finally { con.Close(); }

Asymmetric encryption manages the initial key exchange in other words, agrees on a secret value Then, this secret value symmetrically encrypts all subsequent messages, which ensures the best possible performance..

Before you can use the ASP.NET membership API and the security controls of ASP .NET, you have to complete a few steps: 1. Configure forms authentication in your web.config file as usual, and deny access to anonymous users. 2. Set up the membership data store. For example, if you are using SQL Server, you have to create a couple of tables and stored procedures in a SQL Server database of your choice.

So far, all the examples you ve seen have used hard-coded values. That makes the examples simple, straightforward, and relatively secure. It also means they aren t that realistic, and they don t demonstrate one of the most serious risks for web applications that interact with a database SQL injection attacks. In simple terms, SQL injection is the process of passing SQL code into an application, in a way that was not intended or anticipated by the application developer. This may be possible because of the poor design of the application, and it affects only applications that use SQL string building techniques to create a command with user-supplied values. Consider the example shown in Figure 7-5. In this example, the user enters a customer ID, and the GridView shows all the rows for that customer. In a more realistic example the user would also need to supply some sort of authentication information such as a password. Or, the user ID might be based on a previous login screen, and the text box would allow the user to supply additional criteria such as a date range or the name of a product in the order.

The whole process works like this: 1 The client sends a request to connect to the server 2 The server signs its certificate and sends it to the client This concludes the handshake portion of the exchange 3 The client checks whether the certificate was issued by a CA it trusts If so, it proceeds to the next step In a web browser scenario, the client may warn the user with an ominoussounding message if it does recognize the CA and allow the user to decide whether to proceed 4 The client compares the information in the certificate with the information received from the site (including its domain name and its public key) The client also verifies that the server-side certificate is valid, has not been revoked, and is issued by a trusted CA Then the client accepts the connection 5.

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