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.

last $3$ digits my ID:$383$

first letter my name: w