It was create to solve to SECCON2015 online CTF - Excercise (After)

caesar_cipher.py

# -*- coding: utf-8 -*-
import sys

def create_dict(c,p):
    dic ={}
    for i in range(len(c)):
        dic[c[i]] = p[i]
    return dic

def q_replace(q, dic2):
    answer = ""
    for i in range(len(q)):
        answer += dic2[q[i]]
    return answer

if __name__ == '__main__':
    argvs = sys.argv
    argc = len(argvs)

    # If the number of arguments is not correct...
    if (argc != 4):
        print("Argument is not corrext...")
        print(" ** HOW TO USE ** ")
        print(" python caesar_cipher.py [Cipher] [Plain] [Quiz] ")
        print(" **************** ")
        quit()

    dic2 = create_dict(argvs[1],argvs[2])
    print(" ** Answer ** ")
    print(q_replace(argvs[3], dic2))