I'm new to cryptography and have just completed homework on Monoalphabetic cipher.
I managed to decrypt the cipher text successfully but I cannot identify the key from my plaintext to ciphertext mapping table which is shown below (top is ciphertext and below in caps is what I have substituted with). No substitution were required for
r is substituted with
y is substituted with
y which I am a little confused with.
Although the decrypted message seems correct, I would like to understand what is the key for this.
a b c d e f g h i j D E F G H I K L k l m n o p q r s t M N O P Q R S B T U u v w x y z V W X Y C