Problem 3 (Stenography). Embed your university ID into the given gray-scale picture (lena.png). Please show your results, and also submit the source codes on Isidore. (Note: you may choose to use a random 9-digit number instead for privacy purposes.) a. You may embed it in the way you prefer. Matlab is recommended. b. Hint: the 9-digit ID can be treated as 9 individual values, where each value (0-9) can be converted to a 3-bit binary number. Thus, one way is to embed 3 bits into one pixel (8 bits). Alternatively, each pixel may hide one bit. c. Now extract the hidden value, and convert it back to your ID.