View the step-by-step solution to:

Please help with the following programming using python 3 Ceasar cipher A Ceasar cipher is based on simply shifting the letters in the alphabet by a

Please help with the following programming using python 3


Ceasar cipher

A Ceasar cipher is based on simply shifting the letters in the alphabet by a fixed amount. For example we might do the following:

    Plain:     ABCDEFGHIJKLMNOPQRSTUVWXYZ
    Cipher:    DEFGHIJKLMNOPQRSTUVWXYZABC

So each 'A' in the message is replaced by a 'D', each 'M' by a 'P', and so on. That is, there is a shift of 3 letters. Note that the alphabet wraps around at the end: An 'X' (third from the end) is replaced by an 'A', etc. a function that takes two arguments, a string to encrypt and a shift value (an integer) to use for encrypting it, and returns the encrypted string. Apply the same shift to both lower and upper case letters. Do not alter the non-alphabetical characters (like space, comma etc).




Design a function that takes two arguments, a string to encrypt and a shift value (an integer) to use for encrypting it, and returns the encrypted string. Apply the same shift to both lower and upper case letters. Do not alter the non-alphabetical characters (like space, comma etc).

Examples:

  • Encrypting "Et tu, Brutus!" with a shift of 3 should return "Hw wx, Euxwxv!".
  • (Wikipedia has a long list of Latin phrases if you want to encrypt more examples in Latin.)
  • Encrypting "IBM" with a shift of -1 should return "HAL".

To decrypt a string, you can call the same function with the negative of the shift that was used to encrypt it. Also note that the function is invariant of the shift modulo 26: that is, a shift of 29 is the same as a shift of 3 (3 == 29 % 26), and a shift of -1 is the same as a shift of 25 (25 == -1 % 26).

Top Answer

Below is the function. Let me know if you have any doubt. def Ceasar_encrypt ( string , value ):   result = ""    #... View the full answer

code.PNG

Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

-

Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask a homework question - tutors are online