1. Python Aes Decryption
2. Python Encrypt And Decrypt Data

I have to make a Substitution Cipher Program, where I first create a randomized secret-key and then use this key to decrypt/ encrypt some user input (plaintext). The constraints for the problem as follows:

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Python Aes Decryption

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1. encryptMsg(plaintext,key,alphabet)Takes a plaintext string, an alphabet string and a secret key string as arguments and returns anencrypted cipher string. Note, within this function, you must first convert the plaintext string to alllower case and remove any punctuation/characters that do not appear in the alphabet string!

2. decryptMsg(ciphertext,key,alphabet)Will take a ciphertext string, an alphabet string and a secret key string and return the plaintextstring.

3. makeKey(alphabet)Generate and return a secret-key string by randomly shuffling the characters in the alphabet stringargument. Hint: this involves turning the string into a list, using the random.shuffle()method, then turning the list back into a string

Here's what I have:

I know I'm doing something wrong with the makeKey function because it doesn't work. I need some help on how to start the other functions. We cannot use dictionaries, only list methods. Any help or just advice on jumpstarting me in my assignment will be highly appreciated. Thanks guys!

UPDATE: A sample output is as follows:

Alphabet: 'abcdefghijklmnopqrstuvwxyz.,! '

Key: 'nu.t!iyvxqfl,bcjrodhkaew spzgm'

Input plaintext: Hey, this is really fun!

Cipher text: 'v! zmhvxdmxdmo!nll mikbg'

Decrypted text: 'hey, this is really fun!'

1 Answer

Original answer below:

Please show us some sample input and output for an example. Based on your code, I can come up with the following - random.shuffle shuffles everything in place and returns None, change your makeKey to:

EDIT 2:

For an approach without using dicts in encryption/decryption, see below:

Prints:

Python Encrypt And Decrypt Data

EDIT:

After some spacing issues and experimentation, I came up with this rather simple solution:

This prints:

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