I am interested in learning and understanding cryptography and its application in every day life. One thing I can't seem to get my head around is encrypting plaintext using a block mode such as CFB. I want to use a Caesar block cipher in CFB mode to encrypt the following plaintext: lucozade
with a key: 3
.
So in this case, I get that using the Caeser block cipher the ciphertext for lucozade
would be oxfrcdgh
as the letters have shifted three places to the right. What I can't do is this encryption using CFB mode. How do I go about doing that? Like would I have to use the ciphertext oxfrcdgh
as the IV?
Any help would be great
lucozade
using the caeser block cipher in cfb mode?? $\endgroup$