Suppose I have an encryption function $e$ of a symmetric cipher with plaintext space
Now, consider a list $L$ of integers:
$$67, 114, 121, 112, 116, 111.$$
Decoding $L$ with the ASCII encoding scheme (see http://www.asciitable.com/) gives the word (plaintext) Crypto.
My teacher says that there is a weakness in using the ASCII encoding scheme together with the above mentioned cipher, such that encoding and encrypting the word Crypto results in the six ciphertexts
I do not understand the claim: Any hints?