Decipher the message

knowing that it was encrypted using a Vernam cipher with keys U $=(3,5)$ and V $=(16,23,18).$

$5.$ Decrypt the message

AVGDA VAGVA VXAAF AFAVF DVAA

knowing that it was encoded using the key

A D F G V X

A I W O U L D

D E F R Y $0$ A

F $9$ B C $1$ G H

G J K $2$ M N $7$

V P $3$ Q S $6$ T

X $4$ V X $5$ Z $8$

$85317624.$

P J Z M E P M J Z W E B Y

$4.$ Encrypt

using an affine cipher with modulus $26$ and keys a $=9$ and b $=15.$

$2.$ Compute

and

a $=19787467390475022-592750282085($mod $43)$ and b $=-$ a $($mod $43).$

SWORD

$3.$ Decrypt

knowing that it was a homophonic encipherment with the keyword HUGO.

$73451758821363210633923592378559211405794$