CODEWITHSUNDEEP
pythonencryption
JazzHandz
JazzHandz

Reputation: 3

Python simple encryption

I was trying to create a program which would encrypt a message according to a key or number that the user would give. So for example the letter C with a key of 2 would change to the letter E. I was thinking of using either a saved dictionary or ordinal values for this though I'm unsure on how to limit it to 26 letters. For example, my code right now would look like this:

word = input("Please enter a word")
numkey = input("Please enter a key")

for ind in word:
    encrypt = ord(ind) + int(numkey)
    actual_encrypt = chr(encrypt)

The problem with this code is that I want to limit the encrypt value to 26 and to have it start over again once it reaches there. So instead of 27, for example, it would be 1 again. I'm just a little bit confused on how to set that up. Thank you.

Upvotes: 0

Views: 176

Answers (3)

AndreyF
AndreyF

Reputation: 1838

If I understand right your word contains only the characters: a-z if so you can replace the line:

encrypt =  ord(ind) + int(numkey)

with:

encrypt = ord('a') + (ord(ind) - ord('a') + int(numkey)) % 26

Upvotes: 2

jesper_bk
jesper_bk

Reputation: 503

If I understand your question correctly, the common way to solve this problem is using the modulo operator "%". This operator returns the remainder of an integer division between the operands.

It could look like this:

encrypt = ((ord(ind) + int(numkey)) % 27) + 1

If the result of ord(ind) + int(numkey) is 27, % 27 results in 0 (hence the additional offset of 1).

Upvotes: 0

John Zwinck
John Zwinck

Reputation: 249602

You want the modulus operation, %. For example, 27 % 26 gives 1.

Upvotes: 0

Related Questions