b$.$ Using Vigenere cipher, encrypt the word "questionsandanswers" using the key "matrix".

c$.$ Encrypt the plaintext $$sendmoremoney$$ with the key stream

$9017231521141111289$

d$.$ Using the ciphertext produced in Part $($c$),$ find a key so that the cipher text decrypts to the

plaintext $$cashnotneeded$.$

e$.$ Can a brute$-$force attacker decrypt the ciphertext from Part $($c$)$ so that it knows the original

message in a deterministic manner?