class Tweet(models.Model):
    user = models.ForeignKey(User)
    encrypted_tweet = models.TextField()
    key = models.TextField()
    objects = TweetManager()

from cryptography.fernet import Fernet

def encrypt(request, id, postData):
    key = Fernet.generate_key()
    cipher_suite = Fernet(key)
    user = User.objects.get(id=id)
    binary_tweet = postData['tweet'].encode('UTF-8')
    encrypted_tweet = cipher_suite.encrypt(binary_tweet)
    tweet = Tweet.objects.create(user=user, encrypted_tweet=encrypted_tweet, key=key)
    return tweet.encrypted_tweet

def decrypt(request, search_string):
    binary_search_string = search_string.encode('UTF-8')
    tweet = Tweet.objects.get(encrypted_tweet=binary_search_string)
    key = tweet.key
    cipher_suite = Fernet(key)
    decrypted_tweet = cipher_suite.decrypt(binary_search_string)
    return decrypted_tweet