Código feito para o desafio 'Criptografia de Júlio César' do Codenation. Este código descriptografa uma mensagem com base na cifra de César.

caesar_cypher.py

#!/usr/bin/python3
import json
import hashlib
import requests

access_token = 'CODENATION_TOKEN'

def get_hash(phrase):
    return hashlib.sha1(phrase.encode()).hexdigest()

def get_data():
    url = ('https://api.codenation.dev/v1/challenge/dev-ps/generate-data?token=%s'
            % access_token)
    
    r = requests.get(url)
    return r.json()

def send_data(data):
    url = ('https://api.codenation.dev/v1/challenge/dev-ps/submit-solution?token=%s'
            % access_token)
    files = {'answer': json.dumps(data).encode('utf-8')}

    r = requests.post(url, files=files)
    print(r.json())
    print(r.status_code)

def decrypt(phrase, places):
    alphabet = [chr(i) for i in range(ord('a'),ord('z')+1)]

    decrypted = ""
    for char in phrase:
        if char in alphabet:
            char = alphabet[alphabet.index(char)-places]
        decrypted += char
    return decrypted

def main():
    data = get_data()

    encrypted_phrase = data['cifrado']
    places = data['numero_casas']

    decrypted_phrase = decrypt(encrypted_phrase, places)

    data['decifrado'] = decrypted_phrase
    data['resumo_criptografico'] = get_hash(decrypted_phrase)

    send_data(data)

if __name__ == '__main__':
    main()