For the key, convert the last $3$ digits of your student ID to binary and use that value as the key. "For example, if your Student ID is s$437021872,$ then you'd convert $872$ to binary, which is $1101101000."$

Use the first letter of your name as the plaintext. "For example, if your name is Ziad, then the first letter is $Z,$ which is $01011010$ in binary$.$

Now use S$-$DES to encrypt the first letter of your name using the last $3$ digits in your student ID as the key. Show all the steps of this encryption process.

my ID ends with: $041$

my name starts with: J