Knowing what you know now about frequency analysis, would you feel comfortable sending your password over the internet using a substitution cipher? why or why not?

Substitution ciphers in the world of encryption can be cracked very easily. By looking for patterns like one letter words, double letter patterns, and knowing rules such as all words must contain at least an a, e, i, o, u or y, you are probably able to decipher this with so much ease. While this information and the frequency of letters used in the encrypted message might be helpful, it might not be a perfect process.

No, because substitution ciphers can be broken very easily by frequency analysis.

Explanation:

No, because substitution ciphers can be broken very easily.

They are the oldest form of cipher, look at, for example, Caesar's Cipher.

In a substitution cipher each letter is assigned a ciphered letter. For example, a is assigned d, b assigned e and as follows. By frequency analysis, it is very easily to be broken. For example, in the english language, let's say a is the most frequent character. So in the ciphered text, d is going to be the most frequent character.