Frequency analysis can be performed on polyalphabetic ciphers which makes it weaker than monoalphabetic ciphers
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A cipher is a form of code in which the code is hidden in extra letters or bits to protect the code, and this process is called encoding.
Polyalphabetic ciphers are codes which are primarily based on substitution, using multiple alphabets. Whereas, monoalphabetic ciphers follow a fixed pattern of replacement and the substitution is based on a single cipher key.
Frequency analysis is the process by which we study the alphabets singularly or in groups and naturally when there are many alphabets in the cipher it will be more challenging to perform frequency analysis.
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