Write the difference between monoalphabetic cipher and polyalphabetic cipher.

The difference between monoalphabetic cipher and polyalphabetic cipher are:

Monoalphabetic Cipher Polyalphabetic Cipher
Monoalphabetic cipher is one where each symbol in plain text is mapped to a fixed symbol in cipher text. Polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets.
The relationship between a character in the plain text and the characters in the cipher text is
one-to-one.
The relationship between a character in the plain text and the characters in the cipher text is
one-to-many.
Each alphabetic character of plain text is mapped onto a unique alphabetic character of a cipher text. Each alphabetic character of plain text can be mapped onto ‘m’ alphabetic characters of a cipher text.
A stream cipher is a monoalphabetic cipher if the value of key does not depend on the position of the
plain text character in the plain text stream.
A stream cipher is a polyalphabetic cipher if the value of key does depend on the position of the plain
text character in the plain text stream.
It includes additive, multiplicative, affine and monoalphabetic substitution cipher. It includes autokey, Playfair, Vigenere, Hill, one-time pad, rotor, and Enigma cipher.
It is a simple substitution cipher. It is multiple substitutions cipher.
Monoalphabetic Cipher is described as a substitution cipher in which  the same fixed mappings from plain
text to cipher letters across the entire text are used.
Polyalphabetic Cipher is described as substitution cipher in which plain text letters in different
positions are enciphered using different cryptoalphabets.
Monoalphabetic ciphers are not that strong as compared to polyalphabetic cipher. Polyalphabetic ciphers are much stronger.
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