Strings reading 4.2

Question

Readings: Python_by_Lambert

Chapter 4, Section 4.2 Data Encryption 

 

1. Write the encrypted text of each of the following words using a Caesar

    cipher with a distance value of 3:(Use the sample code they provide)

1. python
2. hacker
3. wow

 

 2. Consult the Table of ASCII values in Chapter 2 and suggest how you

   would modify the encryption and decryption scripts in this section to

   work with strings containing all of the printable characters.

1. You are given a string that was encoded by a Caesar cipher with an

   unknown distance value. The text can contain any of the printable ASCII

   characters. Suggest an algorithm for cracking this code.

Answer 1

(I)

i) sbwkrq

ii) kcfnhu

iii) zrz

(II) limit the character set to capital letters only;

digits use a DIFFERENT key

(III) you have to try sequential offsets: +1,+2,+3,...+25

until you find the one that works