From my research online, I am confused about the difference between a 'monoalphabetic cipher' and 'monoalphabetic substitution cipher'. However, I have got my answer from the websites Kifanga and Cornell.edu for reference:
The following is my answer:
A monoalphabetic substitution cipher is a cipher in which each occurrence of a plaintext symbol is replaced by a corresponding ciphertext symbol to generate ciphertext. The key for such a cipher is a table of the correspondence or a function from which the correspondence is computed.
Monalphabetic substitution ciphers are easy to break using a decryption method called letter frequency analysis. This is done by studying the text in the language of the cipher, and the frequency of each letter can be determined. For example, in the English language, the most frequent letter is
E followed by
T. By substituting the most frequent letter in the ciphertext with the letter
E the second most frequent with the letter
T and so on I will end up with the original plaintext.
Are my definition and description accurate? If not, what is an accurate description and why does it then provide a poor level of security?