Using Hill

$-$

Cipher, Encrypt and decrypt your first

$9$

$$characters of your second name and

family $($Refat Jadallah$)$

$($

I will check that

$)$

$$using the Key: ciphering.Using Hill$-$Cipher, Encrypt and decrypt your first $9$ characters of your second name and

family $($I will check that$)$ using the Key: ciphering.