The VigenĖre Tableau

The following is the tableau used for the VigenĖre, Beaufort, and variant Beaufort ciphers.

   A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

B  B C D E F G H I J K L M N O P Q R S T U V W X Y Z A

C  C D E F G H I J K L M N O P Q R S T U V W X Y Z A B

D  D E F G H I J K L M N O P Q R S T U V W X Y Z A B C

E  E F G H I J K L M N O P Q R S T U V W X Y Z A B C D
F  F G H I J K L M N O P Q R S T U V W X Y Z A B C E F
G  G H I J K L M N O P Q R S T U V W X Y Z A B C E F G
H  H I J K L M N O P Q R S T U V W X Y Z A B C E F G H
I  I J K L M N O P Q R S T U V W X Y Z A B C E F G H I
J  J K L M N O P Q R S T U V W X Y Z A B C E F G H I J
K  K L M N O P Q R S T U V W X Y Z A B C E F G H I J K
L  L M N O P Q R S T U V W X Y Z A B C E F G H I J K L
M  M N O P Q R S T U V W X Y Z A B C E F G H I J K L M
N  N O P Q R S T U V W X Y Z A B C E F G H I J K L M N
O  O P Q R S T U V W X Y Z A B C E F G H I J K L M N O
P  P Q R S T U V W X Y Z A B C E F G H I J K L M N O P
Q  Q R S T U V W X Y Z A B C D E F G H I J K L M N O P
R  R S T U V W X Y Z A B C D E F G H I J K L M N O P Q
S  S T U V W X Y Z A B C D E F G H I J K L M N O P Q R
T  T U V W X Y Z A B C D E F G H I J K L M N O P Q R S
U  U V W X Y Z A B C D E F G H I J K L M N O P Q R S T
V  V W X Y Z A B C D E F G H I J K L M N O P Q R S T U
W  W X Y Z A B C D E F G H I J K L M N O P Q R S T U V
X  X Y Z A B C D E F G H I J K L M N O P Q R S T U V W
Y  Y Z A B C D E F G H I J K L M N O P Q R S T U V W X
Z  Z A B C D E F G H I J K L M N O P Q R S T U V W X Y

VigenĖre

The leftmost column has the keys; the top alphabet has the plaintext. So:

message HELLOWORLD

key     ECSECSECSE

cipher  LGDPQOSTHD

Beaufort

Find the plaintext in the left alphabet, and trace in until you find the key letter. Then turn a right angle and go up. The 
letter at the top alphabet is the ciphertext.

message HELLOWORLD

key     ECSECSECSE

cipher  WYHSOWPLHB

Variant Beaufort

Find the key letter in the left alphabet, and trace in until you find the plaintext  letter. Then turn a right angle and go 
up. The letter at the top alphabet is the ciphertext.

message HELLOWORLD

key     ECSECSECSE

cipher  DCTHMEKPTZ