Vigenere Practice

Encipher the following in Vigenere, using the key be careful:

Stay away from FBI agents

Remember that you encipher in Vigenere by adding the key, so you decipher by subtracting the key. If the key number is too big, be sure to add 26 to the coded letter. For example, you can’t subtract G from B (1 minus 6), so you add 26 to B, making it 27 instead of 1. Now you can just do 27 minus 6.

Decipher the following, using the same key:

GPGER XTHNF