Code:

 


SHONONREKNGREPEONGRE
AHTRNHOPROPGNRTNHHPR
SGOTHPTRHOT?HOPT?HOR
04040346352543LOGOP34?
1432546454H6H65H7II67I


Quote:

 

Then to encrypt a message like "til the cows come home" you encrypt the first letter using the C line, the next letter using the O line, and so on. Here is the message with the line used to encrypt it written below:
CODE

TIL THE COWS COME HOME
COW SCO WSCO WSCO WSCO

so for line C, T is encrypted as V
for line O, I is encrypted as W
for line W, L is encrypted as H
for line S, T is encryptes as L,
for line C, H is encrypted as J
for line O, E is encrypted as S
...and so forth

The final encrypted message, with word breaks preserved, would be:
VWH LJS YGYG YGOS DGOS

Notice the repeating YGYG YG. That's an interesting thing. With Vigenere, encrypting C with a key of W is the same as encrypting W with a key of C. The word COWS is encrypted with a key of WSCO. So CO with a key of WS encrypts as YG. Likewise, WS with a key of CO also encrypts as YG.