W O a b c d e R D A B C f g h i j F G H I J k l m n o L M N P S p r s t u T U V X Z v w x y z Algorithm To encrypt a message, one would follow these steps: Split the payload message into digraphs. (HELLO WORLD becomes HE LL OW OR LD) Find the first letter in the digraph in the upper-left plaintext matrix. a b c d e E X A M P f g h i j L B C D F k l m n o G H I J K p r s t u N O R S T v w x y z U V W Y Z K E Y W O a b c d e R D A B C f g h i j F G H I J k l m n o L M N P S p r s t u T U V X Z v w x y z Find the second letter in the digraph in the lower-right plaintext matrix. a b c d e E X A M P f g h i j L B C D F k l m n o G H I J K p r s t u N O R S T v w x y z U V W Y Z K E Y W O a b c d e R D A B C f g h i j F G H I J k l m n o L M N P S p r s t u T U V X Z v w x y z The first letter of the encrypted digraph is in the same row as the first plaintext letter and the same column as the second plaintext letter. It is therefore in the upper-right ciphertext matrix. a b c d e E X A M P f g h i j L B C D F k l m n o G H I J K p r s t u N O R S T v w x y z U V W Y Z K E Y W O a b c d e R D A B C f g h i j F