Weaknesses and security Flaws of Substitution Ciphers

  

Weaknesses and security Flaws of Substitution Ciphers

 

. the simplest of all substitution ciphers are those in which the cipher alphabet is merely a cyclical shift of the plaintext alphabet. The explanation for this weakness is that the frequence distributions of symbols in the plaintext and I the ciphertext are idential, only the symbol having been relablled

. Another major probloem with simple substitution ciphers is that the frequencies of letters are not masked at all