Please answer BOTH as it is 1 part questions broken down in 2 parts: 1. What is

Question

Please answer BOTH as it is 1 part questions broken down in 2 parts:

1. What is the plaintext for the following ciphertext, which was encrypted using a simple substitution cipher: @par CJBT COZ NPON ZJV FTTK TWRTUYTFGT NJ DTN O XJL. Y COZ ZJV CPJVIK DTN O XJL MYUCN.

2. ROT13 is a cyclic shift cipher that substitutes each English letter with one that is 13 away in the alphabet. It is used today not for security, but as a simple obfuscation device, because the same algorithm is used for both encryption and decryption. People wishing to encrypt or decrypt a message, M (such as a spoiler paragraph in a movie review), just cut-and-paste M to a ROT13 converter and click a button APPLY" to do the encryption or decryption. Give an example of another ROTi transformation that could be used for both encryption and decryption in a similar way.

Explanation / Answer

1.

Cipher text: CJBT COZ NPON ZJV FTTK TWRTUYTFGT NJ DTN O XJL.Y COZ ZJV CPJVIK DTN O XJL MYUCN

Plain Text: SOME SAY THAT YOU NEED EXPERIENCE TO GET A JOB I SAY YOU SHOULD GET A JOB FIRST

Using frequency analysis, the general occurrence of letters of the English alphabet beginning with the most frequent letter is: E T A O I N S R H L D C U M F P G W Y B V K X J Q Z. In the cipher text above, following the same frequency of occurrence, the letters are represented as follows: C for S, J for O, B for M, T for E, O for A, Z for Y, N for T, P for H, V for U, F fro N, K for D, W for X, R for P, U for R, Y for I, F for N, G for C, D for G, X for J and L for B.

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