$$ Problem $1$: Encrypt the plaintext "ALERT" using the key "DGIZO" with the Vernam Cipher.

$$ Problem $2$: Decrypt the ciphertext $"011001010100011101010101".$ The key used for encryption was "HEY".

$$ Problem $3($research required$)$: You are given the plaintext "SECRET" and a short key "ABC" $($which is shorter than the plaintext$).$ Encrypt the message using the Vernam Cipher.

$$ Summary Question $1$: What is the risk of reusing a key in the Vernam Cipher, and how can this compromise the security of the system?