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The TableReader class declares private variables of type OleDbConnection, OleDbCommand, and OleDbDataReader classes at the class level: The OleDbConnection class is used to establish a connection with OLEDB-compliant databases such as Access. The OleDbCommand class is used to execute any query, SQL query, or stored procedures against a database. The OleDbDataReader class allows you to iterate through a result set in a cursor-oriented manner. The intColumnIndex integer variable keeps track of the current column index whose value is to be read. Similarly, the strValue string variable stores the value from the column indicated by intColumnIndex.

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In general, you can use two methods for encryption: symmetric and asymmetric. Symmetric encryption is faster but less secure, and asymmetric encryption is slower but more secure. In a symmetric key environment, both parties use the same key to encrypt and decrypt messages. With asymmetric keys, a public and a private key are used, and this is the important technique that s used for SSH.

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public TableReader(string connectionString,string tableName) { cnn = new OleDbConnection(connectionString); cmd = new OleDbCommand(); cmd.Connection = cnn; cmd.CommandText = tableName; cmd.CommandType = CommandType.TableDirect; cnn.Open(); reader = cmd.ExecuteReader(); } The constructor of the TableReader class accepts two parameters: the database connection string and the name of the table whose data is to be read. Using the connection string, the OleDbConnection is instantiated. The Connection property of the OleDbCommand class is set to the OleDbConnection class we just instantiated. The CommandText property of the OleDbCommand class is set to the name of the table whose data is to be read. Have a look at the CommandType property. It is set to TableDirect, which returns all the rows from the table indicated by the CommandText property. In effect, it works as if we have specified SELECT * FROM <tableName> as the query. The database connection is then opened. The ExecuteReader() method of OleDbCommand is called and an OleDbDataReader is retrieved.

If asymmetric keys are used, every user needs his own public/private key pair and every server needs a pair of them as well. Of these keys, the private key must be protected at all times; if the private key is compromised, the identity of the owner of the private key is compromised as well. In short, stealing a user s private key is like stealing their identity. Therefore, a private key is normally stored in a very secure place where no one other than its owner can access it; typically this is in ~/.ssh. The public key, on the other hand, is available to everyone. Public/private keys are generally used for three purposes: encryption, authentication, and non-repudiation. To send an encrypted message, the sender encrypts the message with the public key of the receiver who can decrypt it with the matching private key. This scenario requires that before you send an encrypted message, you have the public key of the person you want to send the message to. The other options are to use public/private keys for authentication or to prove that a message has not changed since it was created. This method is known as nonrepudiation. In the example of authentication, the private key is used to generate an encrypted token, the salt. If this salt can be decrypted with the public key of the person who wants to authenticate, that proves that the server really is dealing with the right person, and access can be granted. However, this technique requires the public key to be copied to the server before any authentication can occur, which is also the case when keys are used to prove that a message hasn t been tampered with.

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