lambda.py

import os
import time
import random

def lambda_handler(event, context):
    random.seed(int(time.time()))
    flag=os.environ["flag"]
    flagbytes = list(map(ord, flag))
    randos = [random.randint(0,255) for _ in range(len(flag))]
    return {
        'statusCode': 200,
        'body': "".join([hex(randos[i] ^ flagbytes[i])[2:].zfill(2) for i in range(len(flag))])
    }

#trigger URL: https://lpfh8hh7p9.execute-api.us-east-1.amazonaws.com/default/lambdom