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The code in the PasswordHasher class follows the steps that were discussed earlier. First, you use the utility function System.Text.ASCIIEncoding.ASCII.GetBytes to convert the password string into a byte array: // convert password to byte array byte[]passwordBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(password); Next, you use the private shared member hasher, an instance of SHA1Managed, to generate a hash byte array: // generate hash from byte array of password byte[] passwordHash = hasher.ComputeHash(passwordBytes); Finally, you convert the hash back into a string by using the utility function Convert.ToBase64String and return the result: // convert hash to string return Convert.ToBase64String(passwordHash , 0, passwordHash.Length); All the hash algorithm classes in the .NET Framework use this ComputeHash method to get a hash from an input array of bytes. To increase the size of the hash, you can replace the hasher with another one of these, for example: public static class PasswordHasher { private static SHA512Managed hasher = new SHA512Managed(); ... } This change would result in a 512-bit hash, which is probably a bit excessive in this sort of application! The client page, SecurityLibTest.aspx, hashes two passwords and compares the result. The code is basic enough to ignore for now, but it s important to note that the generated hashes vary a great deal for even simple changes to the input data, even just changes of case one of the defining features of good hash generation.

Set each element of buffer to NULL (empty) Flush the serial comms A function called setLED is passed buffer If first letter is r or R... Set integer Ans to number in next part of text Make sure it is between o and 255 Write that value out to the red pin Print out Red is set to: And then the value of Ans If first letter is g or G... Set integer Ans to number in next part of text Make sure it is between o and 255 Write that value out to the green pin Print out Green is set to: And then the value of Ans If first letter is b or B... Set integer Ans to number in next part of text Make sure it is between o and 255 Write that value out to the blue pin Print out Blue is set to: And then the value of Ans

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Encryption comes in many shapes and sizes and continues to be a hot topic. No definitive solution to encrypting data exists, although plenty of advice can be given. In general, there are two forms of encryption: Symmetric encryption: A single key is used both to encrypt and decrypt data. Asymmetric encryption: Separate keys are used to encrypt and decrypt data. The encryption key is commonly known as the public key, and anyone can use it to encrypt information. The decryption key is known as the private key, because it can only be used to decrypt data that has been encrypted using the public key.

ListAdapter adapter=new SimpleCursorAdapter(this, R.layout.row, constantsCursor, new String[] {"title", "value"}, new int[] {R.id.title, R.id.value}); setListAdapter(adapter);

Summary

// Enter row into edit mode protected void grid_RowEditing(object sender, GridViewEditEventArgs e) { // Set the row for which to enable edit mode gridEditIndex = eNewEditIndex; // Set status message statusLabelText = "Editing row # " + eNewEditIndexToString(); // Reload the grid BindGrid(); } The RowEditing event handler receives a GridViewEditEventArgs object named e, which contains, among other details, the index of the row on which the Edit button was clicked (eNewItemIndex) You use this value to inform the GridView to enter in edit mode for that row You take similar action in the CancelCommand event handler, where you cancel edit mode by setting GridView s EditIndex to -1 The way these two event handlers work is fairly standard.

TIP: There may be circumstances in which you want to use your own Cursor subclass, rather than the stock implementation provided by Android. In those cases, you can use queryWithFactory() and rawQueryWithFactory(), which take a SQLiteDatabase.CursorFactory instance as a parameter. The factory is responsible for creating new cursors via its newCursor() implementation.

3 introduced many new commands and concepts in programming. You ve learned about arrays and how to use them, how to read analog values from a pin, how to use PWM pins, and the basics of serial communications. Knowing how to send and read data across a serial line means you can use your Arduino to communicate with all kinds of serial devices and other devices with simple communication protocols. You will revisit serial communications later in this book.

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